Draft: Refactor worker to query projects with stuck MRs
requested to merge unstick-mrs-distinct-each-batch into kerrizor/unstick-mrs-with-nonnull-merge_jids
What does this MR do and why?
Utilizes distinct_each_batch to query target_project_id of MRs that are in locked state.
Behind a feature flag called unstick_mrs_distinct_each_batch so we can turn it off if it shows any unforeseen issue on production.
MR acceptance checklist
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