Intent of Test_DeleteNamespaceWorkflow_ByID, Test_DeleteNamespaceWorkflow_ByName

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
    
    worker/ 2 tests
    
    deletenamespace/ 2 tests
    
    go.temporal.io/server/service/worker/deletenamespace/Test_DeleteNamespaceWorkflow_ByID Introduced here
    
    go.temporal.io/server/service/worker/deletenamespace/Test_DeleteNamespaceWorkflow_ByName Introduced here