[fix](ut) fix convert_tz ut which blocks regression

[zclllyybb]

Proposed changes

Issue Number: close #xxx

some testcases in #24578 are not suitable for all platform.

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[zclllyybb]

run buildall

[github-actions]

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

[github-actions]

PR approved by anyone and no changes requested.

[Gabriel39]

LGTM

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.41% (8019/22023)
Line Coverage: 28.70% (64355/224237)
Region Coverage: 27.65% (33407/120817)
Branch Coverage: 24.28% (17086/70358)
Coverage Report: http://coverage.selectdb-in.cc/coverage/e7351016e68932edfc0882206bc5bfbdfa0f620b_e7351016e68932edfc0882206bc5bfbdfa0f620b/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 45.05 seconds
stream load tsv: 602 seconds loaded 74807831229 Bytes, about 118 MB/s
stream load json: 20 seconds loaded 2358488459 Bytes, about 112 MB/s
stream load orc: 65 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
insert into select: 28.9 seconds inserted 10000000 Rows, about 346K ops/s
storage size: 17162501971 Bytes