Intent of start-to-close_timeout_uses_event_StartTime

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
  - chasm/ 1 test
    
    lib/ 1 test
    
    nexusoperation/ 1 test
    
    TestTransitionStarted/ 1 test
    
    go.temporal.io/server/chasm/lib/nexusoperation/TestTransitionStarted/start-to-close_timeout_uses_event_StartTime Introduced here