jmx-dev RFR: 8332303: Better JMX interoperability with older JDKs, after removing Subject Delegation [v3]

[Kevin Walls]

> Running JConsole from a previous JDK, and attaching to jdk-23 (after [JDK-8326666](https://bugs.openjdk.org/browse/JDK-8326666): Remove the Java Management Extension (JMX) Subject Delegation feature), the MBean tab is blank.
> 
> In javax/management/remote/rmi/RMIConnectionImpl.java:
> addNotificationListener rejects a non-null delegationSubjects array, but older JDKs will send such an array. It could accept the array, and only reject/throw if it contains a non-null Subject (i.e. if an attempt to use subject delegation is really happening).
> 
> Manually testing JConsole, the MBean tab is fully populated and usable.

Kevin Walls has updated the pull request incrementally with two additional commits since the last revision:

 - add an 'also'
 - typo

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19253/files
  - new: https://git.openjdk.org/jdk/pull/19253/files/6c97b5ed..68c791e7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19253&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19253&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19253.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19253/head:pull/19253

PR: https://git.openjdk.org/jdk/pull/19253