EDIT: Sometimes, the labeler action removes the first-contribution label added by the pr_welcome workflow. This should be fixed with a new release of the labeler action, so the next action here is to bump the labeler action.

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WAS: Add a first-contribution label to PRs for easier filtering

Cool! Can it also add a first-contribution label to PRs for easier filtering?

Originally posted by @story645 in #31090 (review)

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Will work on this as a follow-up to #31090.