Intent of TestDeleteNamespace_Success, TestDeprecateNamespace_Success

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
  - service/ 2 tests
    
    frontend/ 2 tests
    
    TestWorkflowHandlerSuite/ 2 tests
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestDeleteNamespace_Success Introduced here
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestDeprecateNamespace_Success Introduced here