Refactor how we fetch ref for merge requests
What does this MR do?
- Make sure we raise early if ref wasn't created
- Only try to fetch_ref for merge requests from forks
Why was this MR needed?
- To make it easier to understand what's causing the problem
- To improve performance by avoiding fetching ref
Does this MR meet the acceptance criteria?
- Tests
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Added for this feature/bug
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- Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
Closes #36089 (closed), #36296 (closed)
Edited by username-removed-423915