RFR: 2326: Don't send the ready for sponsor comment to mailing list if the pr is closed [v2]

[Zhao Song]

On Thu, 11 Jul 2024 23:54:35 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> After we deployed [SKARA-2302](https://bugs.openjdk.org/browse/SKARA-2302) and [SKARA-2322](https://bugs.openjdk.org/browse/SKARA-2322), some users complained about receiving numerous "ready for sponsor" emails from closed PRs.
>> We should prevent the bot from retroactively sending out these emails.
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review comment

Thank you all for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1676#issuecomment-2225921057