Intent of tombstone_batch_is_not_empty

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
    
    history/ 1 test
    
    replication/ 1 test
    
    TestSyncWorkflowState/ 1 test
    
    TestSyncWorkflowState_ReturnSnapshot/ 1 test
    
    go.temporal.io/server/service/history/replication/TestSyncWorkflowState/TestSyncWorkflowState_ReturnSnapshot/tombstone_batch_is_not_empty Introduced here