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19b10993 - [ty] Automatically re-run ecosystem-analyzer workflow on subsequent pushes to a PR, if the PR has the `ecosystem-analyzer` label (#22179)

[ty] Automatically re-run ecosystem-analyzer workflow on subsequent pushes to a PR, if the PR has the `ecosystem-analyzer` label (#22179) ## Summary This PR reworks our ecosystem-analyzer workflow so that it automatically reruns if a PR with the `ecosystem-analyzer` label has new commits pushed to it, or is reopened after previously being closed. It's currently easy to forget that you need to remove and re-add the label to trigger a fresh workflow run, which can then mean that there are stale (misleading) results in the PR comment posted by the bot. It also means that it takes longer for CI to finish than it would otherwise, because it might be a few minutes after pushing new commits to the PR before you remember that you also need to remove and re-add the label. To write this PR, I consulted: - The GitHub workflow trigger documentation: https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows#pull_request - This Stack Overflow answer: https://stackoverflow.com/a/59588725/13990016 ## Test Plan I experimented with pushing commits to this PR and closing/reopening it, and both of these actions triggered fresh runs of the ecosystem-analyzer worfklow when the label was present on the PR. However, removing the label again meant that the workflow was no longer triggered by these actions.