Validate NOT NULL ci_sources_pipelines#project_id

Tomasz Skoruparequested to merge
tskorupa/validate-ci_sources_pipelines_not-null-sharding-key into master

What does this MR do and why?

Validate NOT NULL ci_sources_pipelines#project_id

Addresses #555251

Follows up on !201507 (merged) now that the prepare_async_check_constraint_validation has completed on gitlab.com

Screenshot 2025-08-25 at 12.36.44 PM.png

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Edited by Tomasz Skorupa

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