Intent of ignores_workflow_metadata_keys, ignores_standalone_activity_metadata_keys, +1

All 3 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 3 tests
- server/ 3 tests
  - common/ 3 tests
    
    contextutil/ 3 tests
    
    TestContextMetadataGetActivityTypeAndTaskQueue/ 3 tests
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetActivityTypeAndTaskQueue/ignores_standalone_activity_metadata_keys Introduced here
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetActivityTypeAndTaskQueue/ignores_workflow_metadata_keys Introduced here
    
    go.temporal.io/server/common/contextutil/TestContextMetadataGetActivityTypeAndTaskQueue/returns_single_activity_type_and_task_queue Introduced here