YARN-11886. Introduce Capacity Scheduler UI.

[brumi1024]

Description of PR

Migrate the new YARN Scheduler UI, and ensure maven builds it when the -Pyarn-ui flag is present. For details and the design doc please see the jira YARN-11885.

How was this patch tested?

Ran the build command and checked the artifacts.

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 0s		Docker mode activated.
-1 ❌	patch	0m 21s		#8076 does not apply to trunk. Rebase required? Wrong Branch? See https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute for help.

Subsystem	Report/Notes
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8076/1/console
versions	git=2.34.1
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 0s		Docker mode activated.
-1 ❌	patch	0m 22s		#8076 does not apply to trunk. Rebase required? Wrong Branch? See https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute for help.

Subsystem	Report/Notes
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8076/2/console
versions	git=2.34.1
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[slfan1989]

@brumi1024 This looks really cool—thanks for your contribution!

[brumi1024]

Thanks @slfan1989 😊