RFR: 8342707: Prepare Gatherers for graduation from Preview [v3]

[Viktor Klang]

On Fri, 8 Nov 2024 13:43:26 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 with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Updating copyright years and removing an unneccessary import for Gatherers
>  - Removing PreviewFeature from Gatherers
>  - Updating @since to 24 for Gatherers

@liach @AlanBateman rebase on current mainline and fixed the conflicts and pushed the update. The CSR is accepted so this should be ready to merge.

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PR Comment: https://git.openjdk.org/jdk/pull/21686#issuecomment-2464805059