RFR: JDK-8310061: Note if implicit annotation processing is being used

[Brian Goetz]

On Thu, 15 Jun 2023 18:16:57 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Emit a note warning of the possibility of changing the implicit running of annotation processors in a future release.

New diagnostic messages look reasonable

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PR Review: https://git.openjdk.org/jdk/pull/14499#pullrequestreview-1484093072