State: The initial state is IN_PROGRESS.
The only legal state transitions is from IN_PROGRESS to COMPLETE.
A PRECONDITION_FAILED will be returned if an invalid transition is requested.
The state can only be set to COMPLETE once. A FAILED_PRECONDITION will be returned if the state is set to COMPLETE multiple times.
If the state is set to COMPLETE, all the in-progress steps within the execution will be set as COMPLETE. If the outcome of the step is not set, the outcome will be set to INCONCLUSIVE.
- In response always set - In create/update request: optional
"complete" "inProgress" "pending" "unknownState"