Changes to Return account backup progress

the response property result/errors became nullable for the status 200

the response property result/messages became nullable for the status 200

the response property result/warnings became nullable for the status 200

added the new 0.00 enum value to the result/status response property for the response status 200

added the new 1.00 enum value to the result/status response property for the response status 200

api operation id progress removed and replaced with BackupInfo-progress

added the optional property result/metadata to the response with the 200 status