[fix](test) Isolate cloud mode in colocation proc test

[shuke987]

What problem does this PR solve?

Issue Number: N/A

Related PR: #60944

Problem Summary:

ColocationGroupProcDirTest runs with a local mock FE and a background heartbeat daemon. Four cloud proc tests temporarily changed the process-wide Config.deploy_mode to cloud. If heartbeat ran during that window, it could enter cloud-only backend handling against the local SystemInfoService, fail the heartbeat, and persist the only mock backend as dead. Later tests then failed during table setup with zero available backends, before reaching their proc assertions.

Replace the process-wide configuration changes with thread-scoped static mocks of Config.isCloudMode(). The proc call under test still exercises the cloud branch, while the heartbeat thread continues to observe local mode.

Classification: case bug. Product proc behavior and assertions are unchanged.

Validation:

• git diff --check
• Full FE UT validation will run through run buildall on this PR.

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
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4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[shuke987]

run buildall

[hello-stephen]

TPC-H: Total hot run time: 29487 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit 92ec279564f04bdee93f52298232039df04e38db, data reload: false
------ Round 1 ----------------------------------
============================================
q1	17566	3946	3942	3942
q2	2027	314	201	201
q3	10302	1500	818	818
q4	4734	472	336	336
q5	7929	844	593	593
q6	275	179	135	135
q7	798	855	627	627
q8	10611	1540	1672	1540
q9	6021	4377	4402	4377
q10	6842	1808	1525	1525
q11	509	357	310	310
q12	716	567	423	423
q13	18106	3946	2793	2793
q14	266	256	236	236
q15	q16	786	773	711	711
q17	1037	963	1010	963
q18	6840	5845	5614	5614
q19	1213	1211	1040	1040
q20	776	668	536	536
q21	5750	2679	2474	2474
q22	436	354	293	293
Total cold run time: 103540 ms
Total hot run time: 29487 ms
----- Round 2, with runtime_filter_mode=off -----
============================================
q1	4290	4205	4189	4189
q2	298	309	210	210
q3	4616	4931	4432	4432
q4	2030	2156	1375	1375
q5	4431	4301	4277	4277
q6	224	177	126	126
q7	2081	1874	1640	1640
q8	2490	2089	2103	2089
q9	7710	7678	7793	7678
q10	4746	4697	4303	4303
q11	558	397	575	397
q12	798	791	573	573
q13	3317	3556	3038	3038
q14	307	302	291	291
q15	q16	710	723	647	647
q17	1361	1315	1319	1315
q18	7970	7528	6835	6835
q19	1104	1075	1052	1052
q20	2221	2197	1920	1920
q21	5197	4575	4411	4411
q22	533	446	412	412
Total cold run time: 56992 ms
Total hot run time: 51210 ms

[hello-stephen]

TPC-DS: Total hot run time: 179463 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpcds-tools
TPC-DS sf100 test result on commit 92ec279564f04bdee93f52298232039df04e38db, data reload: false
query5	4343	630	492	492
query6	450	212	193	193
query7	4881	613	342	342
query8	341	183	170	170
query9	8767	4025	4027	4025
query10	459	336	286	286
query11	5944	2322	2136	2136
query12	155	109	102	102
query13	1256	614	468	468
query14	6261	5271	4956	4956
query14_1	4293	4267	4320	4267
query15	214	214	185	185
query16	1010	483	452	452
query17	1139	736	573	573
query18	2529	485	345	345
query19	206	194	156	156
query20	119	108	109	108
query21	233	159	135	135
query22	13584	13569	13479	13479
query23	17357	16557	16227	16227
query23_1	16261	16148	16316	16148
query24	7445	1745	1278	1278
query24_1	1338	1318	1308	1308
query25	576	502	384	384
query26	1335	370	202	202
query27	2588	553	392	392
query28	4457	2038	1980	1980
query29	1079	646	503	503
query30	338	263	228	228
query31	1111	1112	996	996
query32	107	65	62	62
query33	543	338	259	259
query34	1157	1115	665	665
query35	776	794	673	673
query36	1446	1412	1255	1255
query37	154	107	94	94
query38	1900	1703	1643	1643
query39	923	919	914	914
query39_1	892	877	885	877
query40	251	205	137	137
query41	64	62	64	62
query42	89	89	93	89
query43	325	321	281	281
query44	1442	772	771	771
query45	202	188	173	173
query46	1092	1211	737	737
query47	2383	2375	2309	2309
query48	389	418	295	295
query49	589	434	304	304
query50	1025	431	362	362
query51	10987	10821	10698	10698
query52	85	84	79	79
query53	264	285	217	217
query54	265	232	213	213
query55	72	69	66	66
query56	296	276	274	274
query57	1414	1386	1338	1338
query58	285	253	245	245
query59	1564	1609	1389	1389
query60	293	267	252	252
query61	152	149	147	147
query62	704	653	581	581
query63	245	203	205	203
query64	2815	1015	864	864
query65	4877	4772	4856	4772
query66	1839	524	390	390
query67	29508	28824	29342	28824
query68	3110	1607	1006	1006
query69	423	309	269	269
query70	1090	961	1008	961
query71	348	327	291	291
query72	3143	2732	2289	2289
query73	864	797	446	446
query74	5115	4924	4770	4770
query75	2636	2582	2211	2211
query76	2317	1176	765	765
query77	354	374	270	270
query78	12365	12440	11854	11854
query79	1397	1165	763	763
query80	1272	535	464	464
query81	513	337	271	271
query82	618	156	123	123
query83	366	316	289	289
query84	279	163	127	127
query85	974	584	504	504
query86	426	307	293	293
query87	1825	1809	1745	1745
query88	3715	2780	2727	2727
query89	449	413	356	356
query90	1887	207	192	192
query91	196	195	159	159
query92	61	61	54	54
query93	1660	1502	981	981
query94	736	360	340	340
query95	795	523	473	473
query96	1022	772	358	358
query97	2712	2692	2567	2567
query98	208	207	202	202
query99	1164	1176	1060	1060
Total cold run time: 266001 ms
Total hot run time: 179463 ms

[hello-stephen]

ClickBench: Total hot run time: 24.94 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 92ec279564f04bdee93f52298232039df04e38db, data reload: false
query1	0.01	0.01	0.00
query2	0.09	0.05	0.04
query3	0.26	0.14	0.13
query4	1.62	0.14	0.15
query5	0.23	0.22	0.23
query6	1.22	1.13	1.10
query7	0.08	0.01	0.00
query8	0.05	0.04	0.04
query9	0.38	0.30	0.31
query10	0.55	0.58	0.53
query11	0.20	0.15	0.15
query12	0.19	0.14	0.14
query13	0.47	0.46	0.47
query14	1.01	1.00	1.00
query15	0.61	0.60	0.60
query16	0.30	0.31	0.31
query17	1.08	1.13	1.09
query18	0.24	0.20	0.22
query19	2.05	1.84	1.94
query20	0.02	0.02	0.02
query21	15.40	0.23	0.15
query22	4.85	0.05	0.05
query23	16.15	0.30	0.12
query24	2.98	0.43	0.33
query25	0.10	0.05	0.06
query26	0.74	0.20	0.16
query27	0.05	0.03	0.04
query28	3.51	0.91	0.54
query29	12.52	4.00	3.19
query30	0.27	0.16	0.15
query31	2.78	0.61	0.32
query32	3.23	0.59	0.49
query33	3.16	3.22	3.20
query34	15.54	4.25	3.52
query35	3.51	3.52	3.54
query36	0.56	0.44	0.43
query37	0.09	0.07	0.06
query38	0.05	0.04	0.04
query39	0.04	0.03	0.03
query40	0.19	0.17	0.15
query41	0.07	0.03	0.03
query42	0.04	0.03	0.03
query43	0.04	0.05	0.04
Total cold run time: 96.53 s
Total hot run time: 24.94 s

[hello-stephen]

FE UT Coverage Report

Increment line coverage `` 🎉
Increment coverage report
Complete coverage report

[shuke987]

/review

[github-actions]

Reviewed the test-only change in ColocationGroupProcDirTest. I did not find a blocking issue.

Checkpoint conclusions:

• Goal/test coverage: the patch keeps the cloud-mode colocation proc tests focused on the intended cloud fallback and ReplicaAllocation == "null" behavior while avoiding direct global Config.deploy_mode mutation.
• Scope: the modification is narrow and limited to the affected FE unit test.
• Concurrency/locking/lifecycle: no production concurrency or locking path is changed; the new static mocks are scoped by try-with-resources, and the existing table unregister/register cleanup remains intact.
• Compatibility/persistence/config passing: no persisted format, RPC/Thrift, or runtime config behavior is changed.
• Parallel paths/performance/observability: no production path changes.
• Tests: this PR only adjusts existing FE unit tests. I did not run the FE test suite in this review-only runner.
• User focus: no additional user focus was provided.

Subagent convergence: normal test-harness, production-coverage, and risk-focused subagents all returned NO_NEW_VALUABLE_FINDINGS for the final no-inline comment set.

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[deardeng]

LGTM