Intent of success:_mix_new_and_already_exists_search_attributes

All 1 exact test in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 1 test
- server/ 1 test
  - service/ 1 test
    
    frontend/ 1 test
    
    TestOperatorHandlerSuite/ 1 test
    
    Test_AddSearchAttributesSQL/ 1 test
    
    go.temporal.io/server/service/frontend/TestOperatorHandlerSuite/Test_AddSearchAttributesSQL/success:_mix_new_and_already_exists_search_attributes Introduced here