RFR: 8334165: Remove serialVersionUID compatibility logic from JMX [v4]

[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.

Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:

  Replace the missing serialField comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20856/files
  - new: https://git.openjdk.org/jdk/pull/20856/files/df5b0f4c..5c44b1d4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20856&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20856&range=02-03

  Stats: 14 lines in 4 files changed: 14 ins; 0 del; 0 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