Remove HipChat integration from GitLab
What does this MR do?
Removes the HipChat project service integration.
- One controller spec needs distangling from HipChat reliance: !23774 (merged)
- Remove errant rows in the database
- Prevent project exports containing hipchat services from becoming invalid
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
- Changelog entry added, if necessary
- Documentation created/updated
- Tests added for this feature/bug
- Conforms to the code review guidelines
- Conforms to the merge request performance guidelines
- Conforms to the style guides
- Conforms to the database guides
Closes #52424 (closed)