TEZ-4643: Enforce speculation configuration to prevent execution on normal tasks.

[qijiale76]

A configuration meant to distinguish between slow and normal task attempts is not working correctly. This causes the speculation mechanism to target normal tasks as well, wasting considerable resources. This fix ensures the configuration is enforced, limiting speculative execution to only outlier or slow tasks.

tez.am.legacy.speculative.slowtask.threshold

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	26m 35s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ master Compile Tests _
+1 💚	mvninstall	11m 19s		master passed
+1 💚	compile	0m 42s		master passed
+1 💚	checkstyle	1m 7s		master passed
+1 💚	javadoc	0m 32s		master passed
+0 🆗	spotbugs	2m 34s		tez-dag in master has 785 extant spotbugs warnings.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 30s		the patch passed
+1 💚	codespell	0m 34s		No new issues.
+1 💚	compile	0m 28s		the patch passed
+1 💚	javac	0m 28s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 16s		the patch passed
+1 💚	javadoc	0m 10s		the patch passed
+1 💚	spotbugs	1m 51s		the patch passed
			_ Other Tests _
+1 💚	unit	5m 0s		tez-dag in the patch passed.
+1 💚	asflicense	0m 13s		The patch does not generate ASF License warnings.
		53m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-424/1/artifact/out/Dockerfile
GITHUB PR	#424
Optional Tests	dupname asflicense javac javadoc unit spotbugs checkstyle codespell detsecrets compile
uname	Linux 050a0d2686b2 5.15.0-144-generic #157-Ubuntu SMP Mon Jun 16 07:33:10 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-agent/workspace/tez-multibranch_PR-424/src/.yetus/personality.sh
git revision	master / 598b1d3
Default Java	Ubuntu-21.0.8+9-Ubuntu-0ubuntu124.04.1
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-424/1/testReport/
Max. process+thread count	244 (vs. ulimit of 5500)
modules	C: tez-dag U: tez-dag
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-424/1/console
versions	git=2.43.0 maven=3.8.7 spotbugs=4.9.3 codespell=2.0.0
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