RFR: 8334165: Remove serialVersionUID compatibility logic from JMX

[Kevin Walls]

Remove very very old serialization compatibility logic from JMX.

This relates to keeping the JDK's JMX implementation compatible with JMX versions from when JMX was a separate component, before being integrated into JDK 5.  It should all be removed.

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Commit messages:
 - whitespace
 - Remove additional jmx.serial.form reference in private javadoc
 - Remove SuppressWarmnings for SVUID not constant
 - Remove test
 - 8334165: remove serialVersionUID compatibility logic from JMX

Changes: https://git.openjdk.org/jdk/pull/20856/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20856&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334165
  Stats: 1952 lines in 21 files changed: 2 ins; 1785 del; 165 mod
  Patch: https://git.openjdk.org/jdk/pull/20856.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20856/head:pull/20856

PR: https://git.openjdk.org/jdk/pull/20856