Intent of api.go ×4

All 5 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 5 tests
- server/ 5 tests
  - service/ 5 tests
    
    history/ 5 tests
    
    TestEngineSuite/ 5 tests
    
    go.temporal.io/server/service/history/TestEngineSuite/TestRequestCancel_RespondWorkflowTaskCompleted_NoHeartBeat Inherited TestRequestCancel_RespondWorkflowTaskCompleted_NoHeartBeat
    
    go.temporal.io/server/service/history/TestEngineSuite/TestRequestCancel_RespondWorkflowTaskCompleted_Success Inherited TestRequestCancel_RespondWorkflowTaskCompleted_Success
    
    go.temporal.io/server/service/history/TestEngineSuite/TestRequestCancel_RespondWorkflowTaskCompleted_SuccessWithQueries Inherited TestRequestCancel_RespondWorkflowTaskCompleted_SuccessWithQueries
    
    go.temporal.io/server/service/history/TestEngineSuite/TestRespondActivityTaskCanceledById_Started Inherited TestRespondActivityTaskCanceledById_Started
    
    go.temporal.io/server/service/history/TestEngineSuite/TestRespondActivityTaskCanceled_Started Inherited TestRespondActivityTaskCanceled_Started