Fix the database schema

What does this MR do?

Due to the merge_db_schema merge driver not being configured when merging automatically, the schema changes from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23763 did not make it into EE. This then caused build failures such as https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/134700157. This resolves the problem by updating the schema to the right state.

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/8856

Does this MR meet the acceptance criteria?

• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Security reports checked/validated by reviewer