RFR: 2065: Update PR labels when new files are touched [v2]

[Zhao Song]

On Thu, 28 Aug 2025 22:41:34 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Or there is another Option, we can add the check here. And in pullRequestWorkItem, after processing a label command, we can schedule a LabelerWorkItem
>
> Hm, that could work, but it would also mean that we need to schedule an initial LabelerWorkItem when bot is starting up, or rather, we need to let the very first one through regardless of commit hash. This is in case a LabelCommand was issued and handled right before bot was restarted. 
> 
> The alternative would be to compare dates on comments. If the label "command handled" comment has a later date than the last update of the auto labeler comment, then we need to run. If we do that, then the labeler needs to always touch the comment to mark when it was last run. Not sure which is best. If we end up spawning a lot of LabelereWorkItems, it could turn into a lot of comment updates.

I think the first one is pretty easy, we just need to check if the pr has been marked as auto labeled or not.

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PR Review Comment: https://git.openjdk.org/skara/pull/1735#discussion_r2308715847