Intent of allowed_tag_value_is_not_normalized

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
    
    metrics/ 2 tests
    
    TestNormalizeTagsForCaching/ 1 test
    
    go.temporal.io/server/common/metrics/TestNormalizeTagsForCaching/allowed_tag_value_is_not_normalized Introduced here
    
    go.temporal.io/server/common/metrics/TestTallyScope Inherited TestTallyScope