RFR: 2667: Remove jmx-dev rules, merge into serviceability-dev [v2]

[Iris Clark]

On Tue, 17 Feb 2026 18:38:45 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

>> The jmx-dev group is being dissolved, merged into serviceability.
>> Please review this update to the mailing list rules.
>
> Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Also remove jmx-dev from GitMlRules.java

Marked as reviewed by iris (no project role).

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PR Review: https://git.openjdk.org/skara/pull/1751#pullrequestreview-3815813160