What does this MR do?
Fix "unknown repository" of a GitHub Pull Request after renamed or deleted the repo/fork. The GitHub Pull Requests API returns
repo attribute of the source branch for these PRs.
Why was this MR needed?
Without this fix, GitHub Pull Requests where the source repo/fork was renamed or deleted won't be imported.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
Changelog entry added
API support added
Added for this feature/bug
All builds are passing
Conform by the merge request performance guides
Conform by the style guides
Branch has no merge conflicts with
master(if it does - rebase it please)
Squashed related commits together
What are the relevant issue numbers?
Closes #24594 (closed)