Apply parentClosePolicy to child workflow only

[yycptt]

What changed?

• Add externalExecution and ChildWorkflowExecutionOnly field to history terminateWorkflowExecution api (similar to existing history RequestCancelWorkflowExecution)
• Use those two fields when applying parent close policy (in both transfer task executor and system workflow)

Why?

• If child workflow is in Init state when a workflow is closed, then we don't have runID for that child and we only use the workflowID to apply the parent close policy, which might be applied to an unrelated workflow.

How did you test it?

• Added unit test

Potential risks

Is hotfix candidate?
yes.