Intent of partition_API:_empty_workers_returns_gracefully

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/partition_API:_empty_workers_returns_gracefully Introduced here