Add NOT NULL (NOT VALID) constraint to approval_merge_request_rules_users#project_id

Tomasz Skoruparequested to merge
tskorupa/add-not-null-not-valid-to-approval_merge_request_rules_users-on-project_id into master

What does this MR do and why?

Add NOT NULL (NOT VALID) constraint to approval_merge_request_rules_users#project_id

Epic: &11670

Preventing new rows from being inserted with a NULL sharding key.

The backfill of existing rows is being done in !197054 (merged).

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