RFR: 8342707: Prepare Gatherers for graduation from Preview [v4]

[Alan Bateman]

On Fri, 8 Nov 2024 13:56:38 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> Make final adjustments to drop PreviewFeature and updating the @ since markers.
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updating the copyright year of the Gatherer benchmarks

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21686#pullrequestreview-2423918386