Prepare async check constraint on approval_merge_request_rules_users#project_id

Tomasz Skoruparequested to merge
tskorupa/prepare_amrru_project_id_not_null_validation into master

What does this MR do and why?

Prepare async check constraint on approval_merge_request_rules_users#project_id.

Addresses #560322 (closed)

The constraint name was taken from !199931 (merged) - an earlier MR introducing a NOT NULL (NOT VALID) constraint on approval_merge_request_rules_users#project_id. Existing data was backfilled in !197054 (merged), finalized in !197961 (merged) and shows no rows with a NULL sharding key on gitlab.com.

Edited by Tomasz Skorupa

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