"Fix schema.rb with missing content"

What does this MR do?

db:check-schema-pg is complaining about different schemas after running db:reset (see: https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/232878072)

This MR commits the changes that are missing.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Closes #12227 (closed)