State: The initial state is IN_PROGRESS. The only legal state transitions are * IN_PROGRESS -> COMPLETE
A PRECONDITION_FAILED will be returned if an invalid transition is requested.
It is valid to create Step with a state set to COMPLETE. The state can only be set to COMPLETE once. A PRECONDITION_FAILED will be returned if the state is set to COMPLETE multiple times.
- In response: always set - In create/update request: optional
"complete" "inProgress" "pending" "unknownState"