Intent of empty_worker_key_does_not_populate_shutdown_cache

All 1 exact test in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 1 test
- server/ 1 test
  - service/ 1 test
    
    matching/ 1 test
    
    TestCancelOutstandingWorkerPolls/ 1 test
    
    go.temporal.io/server/service/matching/TestCancelOutstandingWorkerPolls/empty_worker_key_does_not_populate_shutdown_cache Introduced here