TEZ-4685: DagAppMaster is not picking tez-site.xml from classpath

[Aggarwal-Raghav]

Please check screenshots in TEZ-4685

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 22s		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	8m 56s		master passed
+1 💚	compile	0m 24s		master passed
+1 💚	checkstyle	0m 51s		master passed
+1 💚	javadoc	0m 24s		master passed
-1 ❌	spotbugs	1m 3s	/branch-spotbugs-tez-dag.txt	tez-dag in master failed.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 19s		the patch passed
+1 💚	codespell	0m 27s		No new issues.
+1 💚	compile	0m 18s		the patch passed
+1 💚	javac	0m 18s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 11s		the patch passed
+1 💚	javadoc	0m 10s		the patch passed
-1 ❌	spotbugs	0m 17s	/patch-spotbugs-tez-dag.txt	tez-dag in the patch failed.
			_ Other Tests _
+1 💚	unit	5m 25s		tez-dag in the patch passed.
+1 💚	asflicense	0m 11s		The patch does not generate ASF License warnings.
		20m 8s

Subsystem	Report/Notes
Docker	ClientAPI=1.53 ServerAPI=1.53 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-458/1/artifact/out/Dockerfile
GITHUB PR	#458
Optional Tests	dupname asflicense javac javadoc unit spotbugs checkstyle codespell detsecrets compile
uname	Linux cdb2f8f4b9fb 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-home/workspace/tez-multibranch_PR-458/src/.yetus/personality.sh
git revision	master / f2eba56
Default Java	Ubuntu-21.0.9+10-Ubuntu-124.04
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-458/1/testReport/
Max. process+thread count	246 (vs. ulimit of 5500)
modules	C: tez-dag U: tez-dag
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-458/1/console
versions	git=2.43.0 maven=3.8.7 codespell=2.4.1
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