Intent of TestRegisterNamespace_Success_NotEnabled

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
    
    frontend/ 5 tests
    
    TestWorkflowHandlerSuite/ 5 tests
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestDeleteNamespace_Error Inherited namespace_handler.go ×1
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestDeleteNamespace_Success Inherited TestDeleteNamespace_Success, TestDeprecateNamespace_Success
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestDeprecateNamespace_Error Inherited namespace_handler.go ×1
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestDeprecateNamespace_Success Inherited TestDeleteNamespace_Success, TestDeprecateNamespace_Success
    
    go.temporal.io/server/service/frontend/TestWorkflowHandlerSuite/TestRegisterNamespace_Success_NotEnabled Introduced here