Intent of TestWithTags_DifferentTagsReturnDifferentHandlers

All 4 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 4 tests
- server/ 4 tests
  - common/ 4 tests
    
    metrics/ 4 tests
    
    go.temporal.io/server/common/metrics/TestScopeCache_IndependentPerHandler Inherited TestScopeCache_IndependentPerHandler
    
    go.temporal.io/server/common/metrics/TestWithTags_ChildCachesAreIndependent Inherited TestWithTags_ChildCachesAreIndependent
    
    go.temporal.io/server/common/metrics/TestWithTags_DifferentTagsReturnDifferentHandlers Introduced here
    
    go.temporal.io/server/common/metrics/TestWithTags_MultipleTagsCacheCorrectly Inherited TestWithTags_MultipleTagsCacheCorrectly