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ARROW-10724: [Dev Tools] Added labeler to PRs that need rebase.

This is a proposal to have a github action that automatically adds labels to PRs that need rebase.

We have been adding these labels manually in Rust PRs, as it is easier to filter for PRs that need an action from the contributor before merging.

By doing this systematically, we do not need to maintain these labels ourselves.

Note that this action takes seconds to complete.

Closes #8768 from jorgecarleitao/pr_needs_rebase

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Uwe L. Korn <uwe.korn@quantco.com>