Make "merge ongoing" check more consistent
What does this MR do?
Check if there's any job running for MergeRequest#merge_jid
in order to make our MR widget state more consistent.
Why was this MR needed?
Further explained on #39032 (closed)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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Conform by the style guides -
Squashed related commits together
What are the relevant issue numbers?
Closes #39032 (closed)