The cherry-pick and backport workflows create PRs under
`github-actions[bot]`. Since GitHub doesn't support creating PRs on
behalf of another user, this adds attribution to the user who added the
label (`github.event.sender.login`):
- **Assignee**: the labeler is assigned to the backport PR
- **Reviewer**: the labeler is added as a reviewer
- **PR body**: includes "Requested by: @user"
Applied to both `cherry-pick.yaml` and `backport.yaml`.
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