Enable NOT filtering for source branches in MR List GQL
What does this MR do and why?
When I was porting the HAML filters for the Merge Request list to Vue, I missed raising the issue that the back end doesn't support negating the Source Branch filter.
This change adds that ability to the back end.
References
- Port of Source Branch filter (
=-only) to Vue: !150758 (merged) - Original issue: #442924 (closed)
MR acceptance checklist
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Screenshots or screen recordings
All backstage GQL work.