tcn.delivery.transport.v1alpha1.TransferStatus(TransferStatus)
(-- api-linter: core::0126::unspecified=disabled
aip.dev/not-precedent: Dont break old values already in the db. --)
(-- api-linter: core::0216::synonyms=disabled
aip.dev/not-precedent: Legacy everything was named around statuses not states --)
the status of the transfer
"TRANSFER_STATUS_WAITING"