Intent of creates_cancellation_child

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 2 tests
- server/ 2 tests
  - chasm/ 2 tests
    
    lib/ 2 tests
    
    workflow/ 2 tests
    
    TestCancelRequestedEventDefinitionApply/ 1 test
    
    go.temporal.io/server/chasm/lib/workflow/TestCancelRequestedEventDefinitionApply/creates_cancellation_child Introduced here
    
    go.temporal.io/server/chasm/lib/workflow/TestCancelRequestCompletedEventDefinitionApply Inherited nexus_events.go ×2