Change cloud MYSQL_TABLE to VCloudRecords
Change cloud MYSQL_TABLE to VCloudRecords

- to allow calls to _get_records to work.
- The class for cloud records assumes VOGroup (not VOGroupID) etc are in the database
- This prevents _get_records from working for cloud records
- fortunately it seems like its only used in tests (i.e. MYSQL_TABLES is only mentioned in
  _get_records/get_records, which are in turn only calle din testing
- this change makes the cloud record the same a job record in MYSQL_TABLES and will
  allow for similar testing of cloud records as we have for job records

stfc/apel,apel/apel,stfc/apel,tofu-rocketry/apel,apel/apel,tofu-rocketry/apel