Fix migration for removing MR diff indexes
What does this MR do?
This MR fixes the migration that removes the unique index/constraint from merge_request_diffs.merge_request_id
Does this MR meet the acceptance criteria?
- Tests
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All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together
cc @stanhu