Do not bypass task generation when version changes (#7890)

## What changed?
Server sends new wft in response of preious wft completion. This should
not happen if the next wft is supposed to go to a different worker
version.

## Why?
When there is a transition, workflow could fall into an infinite loop of
workflow tasks because they never go to the right worker.

## How did you test it?
- [ ] built
- [ ] run locally and tested manually
- [ ] covered by existing tests
- [ ] added new unit test(s)
- [ ] added new functional test(s)
will be verified in Nightlies.

## Potential risks
None

Author: ShahabT

service/history/api/respondworkflowtaskcompleted/api.go

@@ -536,6 +536,12 @@ func (handler *WorkflowTaskCompletedHandler) Invoke(
 			}
 		}
 
+		if ms.GetDeploymentTransition() != nil {
+			// Do not return new wft to worker if the workflow is transitioning to a different deployment version.
+			// Let the task go through matching and get dispatched to the right worker
+			bypassTaskGeneration = false
+		}
+
 		var newWTErr error
 		// If we checked WT heartbeat timeout before and WT wasn't timed out,
 		// then OriginalScheduledTime needs to be carried over to the new WT.