gha(update-label-backport): ignore leading 'v' in branch parameter #34013
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The blamed commit modified the call-backport-label-updater workflow to directly call the update-label-backport-pr reusable workflow passing github.base_ref as branch name, rather than manually computing it. However, the branch name includes a leading 'v' (e.g., v1.15), while the backport labels don't (e.g., backport-done/1.15), causing the update to fail. Let's fix this by removing the leading 'v' from the branch name, if present.
Successfully tested in my personal fork (last time I had incorrectly used backport labels with the leading v).
Fixes: e91378b ("gha: simplify the call-backport-label-updater workflow")