Intent of reserved_search_attribute_(empty_index)

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
    
    TestAdminHandlerSuite/ 1 test
    
    Test_RemoveSearchAttributes_EmptyIndexName/ 1 test
    
    go.temporal.io/server/service/frontend/TestAdminHandlerSuite/Test_RemoveSearchAttributes_EmptyIndexName/reserved_search_attribute_(empty_index) Introduced here