Intent of update.go ×2

All 8 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 8 tests
- server/ 8 tests
  - service/ 8 tests
    
    history/ 8 tests
    
    workflow/ 8 tests
    
    update/ 8 tests
    
    TestAttachCallbacks/ 8 tests
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/buffered_callbacks_lost_when_Update_struct_is_recreated Inherited buffered_callbacks_lost_when_Update_struct_is_recreated
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/on_stateSent_buffers_callbacks_and_returns_true Inherited on_stateSent_buffers_callbacks_and_returns_true
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/on_stateSent_dedup_by_requestID_buffers_only_once Inherited update.go ×1
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/on_stateSent_flush_error_fails_acceptance Inherited update.go ×2
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/on_stateSent_flush_skips_already-persisted_requestID Inherited on_stateSent_flush_skips_already-persisted_requestID
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/on_stateSent_multiple_different_requestIDs Inherited update.go ×1
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/on_stateSent_rejection_clears_buffer Inherited on_stateSent_rejection_clears_buffer
    
    go.temporal.io/server/service/history/workflow/update/TestAttachCallbacks/same_requestID_can_be_re-buffered_on_new_Update_struct_after_loss Inherited update.go ×1