Intent of metadata.go ×2

All 6 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 6 tests
- server/ 6 tests
  - common/ 6 tests
    
    contextutil/ 6 tests
    
    TestContextMetadataGetMarkedActivityIDs/ 4 tests
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetMarkedActivityIDs/ignores_non-activity_keys Inherited ignores_non-activity_keys
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetMarkedActivityIDs/marked_IDs_are_separate_from_resolved_metadata Inherited marked_IDs_are_separate_from_resolved_metadata
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetMarkedActivityIDs/returns_multiple_marked_activity_IDs Introduced here
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetMarkedActivityIDs/returns_single_marked_activity_ID Introduced here
    
    TestContextMetadataMarkActivityID/ 2 tests
    
    go.temporal.io/server/common/contextutil/TestContextMetadataMarkActivityID/marks_activity_ID_on_valid_context Introduced here
    
    go.temporal.io/server/common/contextutil/TestContextMetadataMarkActivityID/marks_multiple_activity_IDs Introduced here