TEZ-4712: Class-level SpotBugs exclusions for generated Protobuf classes

[Aggarwal-Raghav]

1. Consolidate specific SpotBugs exclusions into class-level regex matches in findbugs-exclude.xml files.
2. Generated code should not be manually modified to fix SpotBugs warnings.
3. This change removes redundant rules targeting individual fields (e.g., PARSER, unknownFields) and methods (e.g., maybeForceBuilderInitialization).

[Aggarwal-Raghav]

Once this is merge, will add the rule as part of TEZ-4708 to

<Match>
    <Class name="~org\.apache\.tez\.runtime\.internals\.protocolPB\.TezTaskUmbilicalProtocolProtos.*" />
</Match>

which is causing lot of spotbugs verbose alarms.

[tez-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	13m 36s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	xmllint	0m 0s		xmllint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ master Compile Tests _
+0 🆗	mvndep	0m 34s		Maven dependency ordering for branch
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 10s		Maven dependency ordering for patch
+1 💚	codespell	0m 8s		No new issues.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
			_ Other Tests _
+1 💚	asflicense	0m 50s		The patch does not generate ASF License warnings.
		16m 9s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-489/1/artifact/out/Dockerfile
GITHUB PR	#489
Optional Tests	dupname asflicense codespell detsecrets xmllint
uname	Linux 43927600ef72 5.15.0-174-generic #184-Ubuntu SMP Fri Mar 13 18:41:50 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-agent/workspace/tez-multibranch_PR-489/src/.yetus/personality.sh
git revision	master / 39f2e4c
Max. process+thread count	52 (vs. ulimit of 5500)
modules	C: tez-api tez-runtime-internals tez-runtime-library tez-mapreduce tez-dag U: .
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-489/1/console
versions	git=2.43.0 maven=3.9.14 codespell=2.4.1
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