Clean up schema for table lfs_objects_projects
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=17995) </details> <!--IssueSummary end--> From https://gitlab.com/gitlab-com/infrastructure/issues/1709 (private to GitLab employees): - [x] Wrong data type: created_at should be timestamptz - [x] Wrong data type: updated_at should be timestamptz - [ ] Missing constraint: created_at NOT NULL - [ ] Missing constraint: updated_at NOT NULL - [ ] Missing FK: project_id -> projects - [ ] Missing FK: lfs_object_id -> lfs_objects - [ ] Missing constraint: UNIQUE (lfs_object_id, project_id) (1848 entries violate this rule)
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