YARN-11726: Add logging statements for successful and unsuccessful password retrieval operation

[Hean-Chhinling]

Description of PR

This pull request enhances the getPassword method in the WebAppUtils class within Hadoop YARN by adding logging for password retrieval operations. Previously, if the password retrieval failed due to a misconfiguration or other issues, it failed silently, providing no indication of the error. This update adds:

• Debug Logging: Logs successful password retrieval attempts, showing which alias was retrieved.
• Error Logging: Logs failures in retrieving passwords along with the alias and error details.

These changes improve transparency and traceability, making it easier for administrators to identify misconfigurations or other issues in YARN's password management.

How was this patch tested?

The changes were tested using the existing unit tests for the getPassword method, and the method performed successfully with the added logging functionality. No additional integration tests were required since this change only affects logging behavior.

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	18m 28s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+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	50m 43s		trunk passed
+1 💚	compile	0m 49s		trunk passed with JDK Ubuntu-11.0.24+8-post-Ubuntu-1ubuntu320.04
+1 💚	compile	0m 43s		trunk passed with JDK Private Build-1.8.0_422-8u422-b05-1~20.04-b05
+1 💚	checkstyle	0m 38s		trunk passed
+1 💚	mvnsite	0m 48s		trunk passed
+1 💚	javadoc	0m 56s		trunk passed with JDK Ubuntu-11.0.24+8-post-Ubuntu-1ubuntu320.04
+1 💚	javadoc	0m 49s		trunk passed with JDK Private Build-1.8.0_422-8u422-b05-1~20.04-b05
+1 💚	spotbugs	1m 43s		trunk passed
+1 💚	shadedclient	40m 59s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 36s		the patch passed
+1 💚	compile	0m 39s		the patch passed with JDK Ubuntu-11.0.24+8-post-Ubuntu-1ubuntu320.04
+1 💚	javac	0m 39s		the patch passed
+1 💚	compile	0m 34s		the patch passed with JDK Private Build-1.8.0_422-8u422-b05-1~20.04-b05
+1 💚	javac	0m 34s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 28s		the patch passed
+1 💚	mvnsite	0m 37s		the patch passed
+1 💚	javadoc	0m 43s		the patch passed with JDK Ubuntu-11.0.24+8-post-Ubuntu-1ubuntu320.04
+1 💚	javadoc	0m 43s		the patch passed with JDK Private Build-1.8.0_422-8u422-b05-1~20.04-b05
+1 💚	spotbugs	1m 42s		the patch passed
+1 💚	shadedclient	40m 22s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	5m 28s		hadoop-yarn-common in the patch passed.
+1 💚	asflicense	0m 38s		The patch does not generate ASF License warnings.
		169m 18s

Subsystem	Report/Notes
Docker	ClientAPI=1.47 ServerAPI=1.47 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7148/1/artifact/out/Dockerfile
GITHUB PR	#7148
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 0023e191541f 5.15.0-119-generic #129-Ubuntu SMP Fri Aug 2 19:25:20 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 809e3d8
Default Java	Private Build-1.8.0_422-8u422-b05-1~20.04-b05
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.24+8-post-Ubuntu-1ubuntu320.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_422-8u422-b05-1~20.04-b05
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7148/1/testReport/
Max. process+thread count	527 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7148/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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