HDFS-17641. Change badly distributed blocks metric protobuf requirement to optional

[PrateekSane]

Description of PR

Change from required to optional as not critically important and needed to be optional to allow backwards compatibility to 3.3.

How was this patch tested?

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 55s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	buf	0m 0s		buf was not available.
+0 🆗	buf	0m 0s		buf was not available.
+0 🆗	codespell	0m 0s		codespell was not available.
+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.
			_ trunk Compile Tests _
+1 💚	mvninstall	41m 9s		trunk passed
+1 💚	compile	0m 59s		trunk passed with JDK Ubuntu-11.0.25+9-post-Ubuntu-1ubuntu120.04
+1 💚	compile	0m 50s		trunk passed with JDK Private Build-1.8.0_432-8u432-gaus1-0ubuntu220.04-ga
+1 💚	mvnsite	0m 55s		trunk passed
+1 💚	shadedclient	83m 57s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 50s		the patch passed
+1 💚	compile	0m 57s		the patch passed with JDK Ubuntu-11.0.25+9-post-Ubuntu-1ubuntu120.04
+1 💚	cc	0m 57s		the patch passed
+1 💚	javac	0m 57s		the patch passed
+1 💚	compile	0m 49s		the patch passed with JDK Private Build-1.8.0_432-8u432-gaus1-0ubuntu220.04-ga
+1 💚	cc	0m 49s		the patch passed
+1 💚	javac	0m 49s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 58s		the patch passed
+1 💚	shadedclient	39m 27s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 22s		hadoop-hdfs-client in the patch passed.
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		132m 44s

Subsystem	Report/Notes
Docker	ClientAPI=1.47 ServerAPI=1.47 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7274/1/artifact/out/Dockerfile
GITHUB PR	#7274
Optional Tests	dupname asflicense compile cc mvnsite javac unit buflint bufcompat codespell detsecrets
uname	Linux b98cb0e904d2 5.15.0-125-generic #135-Ubuntu SMP Fri Sep 27 13:53:58 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 417539c
Default Java	Private Build-1.8.0_432-8u432-gaus1-0ubuntu220.04-ga
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.25+9-post-Ubuntu-1ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_432-8u432-gaus1-0ubuntu220.04-ga
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7274/1/testReport/
Max. process+thread count	530 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client U: hadoop-hdfs-project/hadoop-hdfs-client
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7274/1/console
versions	git=2.25.1 maven=3.6.3
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