Intent of stream_sender.go ×3

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
  - service/ 3 tests
    
    history/ 3 tests
    
    replication/ 3 tests
    
    TestStreamSenderSuite/ 3 tests
    
    go.temporal.io/server/service/history/replication/TestStreamSenderSuite/TestSendCatchUp_SingleStack Inherited stream_sender.go ×1
    
    go.temporal.io/server/service/history/replication/TestStreamSenderSuite/TestSendCatchUp_TieredStack_SingleReaderScope Inherited stream_sender.go ×2
    
    go.temporal.io/server/service/history/replication/TestStreamSenderSuite/TestSendCatchUp_TieredStack_TieredReaderScope Inherited stream_sender.go ×2