- Rename metric constants from maintenance_job_* to repo_maintenance_*
- Update metric help text to clarify these are for repo maintenance
- Rename functions: RegisterMaintenanceJob* → RegisterRepoMaintenance*
- Update all test references to use new names
Addresses review comments from @Lyndon-Li on PR #9414
Signed-off-by: Shubham Pampattiwar <spampatt@redhat.com>