TEZ-4725: [WIP] Fix flaky tests in TestAMRecoveryAggregationBroadcast

[maheshrajus]

TODO:
[WIP] TEZ-4725: Fix flaky tests in TestAMRecoveryAggregationBroadcast

[tez-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	8m 50s		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 appears to include 1 new or modified test files.
			_ master Compile Tests _
+1 💚	mvninstall	5m 11s		master passed
+1 💚	compile	4m 2s		master passed
+1 💚	checkstyle	0m 31s		master passed
+1 💚	javadoc	0m 26s		master passed
+0 🆗	spotbugs	0m 54s		tez-tests in master has 6 extant spotbugs warnings.
			_ Patch Compile Tests _
+1 💚	mvninstall	4m 1s		the patch passed
+1 💚	codespell	1m 49s		No new issues.
+1 💚	compile	4m 0s		the patch passed
+1 💚	javac	4m 0s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 26s		the patch passed
+1 💚	javadoc	0m 24s		the patch passed
+1 💚	spotbugs	1m 3s		the patch passed
			_ Other Tests _
+1 💚	unit	70m 52s		root in the patch passed.
+1 💚	asflicense	0m 28s		The patch does not generate ASF License warnings.
		104m 40s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-510/1/artifact/out/Dockerfile
Optional Tests	dupname compile unit asflicense javac javadoc spotbugs checkstyle codespell detsecrets
uname	Linux 79e8c3d814b0 5.15.0-181-generic #191-Ubuntu SMP Fri May 22 19:09:02 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	tez-personality.sh
git revision	master / 92dedd5
Default Java	Eclipse Adoptium-21.0.11+10-LTS
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-510/1/testReport/
Max. process+thread count	1383 (vs. ulimit of 5500)
modules	C: tez-tests U: tez-tests
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-510/1/console
versions	git=2.43.0 maven=3.9.15 spotbugs=4.9.3 codespell=2.4.1
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