Backport 'Rebase' feature from EE to CE

What does this MR do?

It backports 'Rebase' feature from EE to CE

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

#40301 (closed)

Related MRs:

gitlab-ee!3890