Remove unused add_member/delete_member
What does this MR do?
Remove unused methods
Does this MR meet the acceptance criteria?
- Code review guidelines
- Merge request performance guidelines
- Style guides
- [-] Database guides
- Separation of EE specific content
Performance and testing
- Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
Closes #9076 (closed)