RFR: 2328: Ignore bot user's comment when determining the latest action time of a PR [v2]

[Zhao Song]

On Mon, 30 Sep 2024 20:19:35 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> PullRequestPrunerBot is responsible for closing PRs that have not been active for a certain time. However, it currently doesn't ignore comments from bot users when determining the latest action time of a PR.
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update

Thank you for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1687#issuecomment-2444777394