Intent of empty_default_settings

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
  - common/ 2 tests
    
    config/ 2 tests
    
    TestCassandraStoreConsistency_validate/ 2 tests
    
    go.temporal.io/server/common/config/TestCassandraStoreConsistency_validate/empty_default_settings Introduced here
    
    go.temporal.io/server/common/config/TestCassandraStoreConsistency_validate/good_default_settings Inherited good_default_settings