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Draft: Unlink fork relationships when archiving group

Emma Parkrequested to merge
572482/unlink-the-fork-relationship-for-group into master

What does this MR do and why?

Unlink fork relationships when archiving group

Add background job to asynchronously unlink fork relationships for all projects when a group is archived. This prevents malicious merge requests from being smuggled into archived projects through fork relationships.

  • Create Namespaces::UnlinkProjectForksWorker for async processing
  • Add destroy_fork_network_on_group_archive feature flag
  • Process projects in batches of 10 to avoid memory issues
  • Add comprehensive test coverage (22 examples)

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