Enum that represents the state of the long-running operation.
Values:
STATE_UNSPECIFIED (0):
Default unspecified state.
RUNNING (1):
The operation is currently running.
SUCCEEDED (2):
The operation finished with a success status.
CANCELLED (3):
The operation was cancelled.
FAILED (4):
The operation finished with a failure status.
CLOSED (5):
The operation was closed with no action
taken.