Intent of edge_case:_combined_failures_and_declined_just_over_threshold

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
    
    TestHealthCheckerSuite/ 1 test
    
    Test_Check_Mixed_Host_States_Edge_Cases/ 1 test
    
    go.temporal.io/server/service/frontend/TestHealthCheckerSuite/Test_Check_Mixed_Host_States_Edge_Cases/edge_case:_combined_failures_and_declined_just_over_threshold Introduced here