In `CONTRIBUTING.md` point out that PR needs to remove GraalVM reachability metadata related to MBeans

[linghengqian]

Is your feature request related to a problem? Please describe.
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• Yes, refer to
  • Remove MBean-related entries from hibernate-core's metadata #113
  • Add support for org.ehcache:ehcache:3.10.8-jakarta #124
  • Add support for com.hazelcast:hazelcast:5.2.1 #122

Describe the solution you'd like
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• In CONTRIBUTING.md point out that PR needs to remove GraalVM reachability metadata related to MBeans. The following classes seem to cause a lot of misunderstanding, and do not affect nativeTest. The problem is that GraalVM Native Build Tools' Conditional Agent Mode picks up these classes easily.
  • java.lang.management.**
  • jdk.management.**
  • com.sun.management.**
  • sun.management.**
  • javax.management.**

Describe alternatives you've considered
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• Null.

Additional context
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• I did some possible related tests at Some plan to write additional unit tests for the class library need GraalVM Reachability Metadata linghengqian-scratches/graalvm-trace-metadata-smoketest#1 .

[mhalbritter]

Ideally we would have some automated check in place that let's the CI fail if it finds something like this in there. But it should be possible to disable that check if those management classes are really necessary.

[linghengqian]

• I work on this issue.

• Of course I only work with documents, because to be honest I am a Gradle novice and not sure how to write regular tasks for Github Action.

[linghengqian]

• According to Point out that PR needs to remove GraalVM reachability metadata related to MBeans #135, let's move to Using MBeans related GraalVM Reachability Metadata results in unfixed Exception in specific cases graal#6322 to continue exploring.