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CSNAPC-11887: Oracle host removal runs into a constraint error in 6.2.1

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Issue

The host removal fails with the constraint error visible in the SnapManagerWeb_<JOB>.log:
DEBUG SnapManagerWeb_<JobID> PID=[xxxx] TID=[xxxx] Delete host ProtectionGroups failed. An error occurred while saving the entity changes. See the inner exception for details.
ERROR SnapManagerWeb_<JobID> PID=[xxxx] TID=[xxxx] Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details.
 ---> MySqlConnector.MySqlException (0x80004005): Cannot delete or update a parent row: a foreign key constraint fails (`nsm`.`nsm_datasetcredentialmapping`, CONSTRAINT `FK_nsm_DatasetCredentialMapping_nsm_protection_group` FOREIGN KEY (`DatasetId`) REFERENCES `nsm_protection_group` (`nsm_protection_group_id`))

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