[Improvement] PR automatic cherry-pick with milestone

[JashBook]

Is your improvement request related to a problem? Please describe.
PR needs manual cherry-pick after merge.

If this is a new function, please describe the motivation and goals.
After PR is merged, it can automatically cherry-pick to the specified release branch.

Describe the solution you'd like

1. PR needs to have a milestone release-x to associate with the release-x branch.
2. release-x branch must exist.
3. only PRs whose title starts with fix/chore will be automatically cherry-picked.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or functions you've considered.

Additional context
Add any other context or screenshots about the improvement request here.

[github-actions]

This issue has been marked as stale because it has been open for 30 days with no activity