Intent of TestRoundTrip_EmptyFailure, TestRoundTrip_OnlyStackTrace, +1

All 6 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 6 tests
- server/ 6 tests
  - common/ 6 tests
    
    nexus/ 6 tests
    
    go.temporal.io/server/common/nexus/TestFromOperationCanceledError Inherited TestFromOperationCanceledError
    
    go.temporal.io/server/common/nexus/TestFromOperationFailedError Inherited TestFromOperationFailedError
    
    go.temporal.io/server/common/nexus/TestRoundTrip_ApplicationFailure Introduced here
    
    go.temporal.io/server/common/nexus/TestRoundTrip_EmptyFailure Introduced here
    
    go.temporal.io/server/common/nexus/TestRoundTrip_OnlyStackTrace Introduced here
    
    go.temporal.io/server/common/nexus/TestRoundTrip_WithNestedCauses Inherited failure.go ×2