Intent of nexus_scheduled,_flag_on,_creates_in_chasm

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
    
    workflow/ 1 test
    
    TestStateBuilderSuite/ 1 test
    
    TestApplyStateMachineEvent/ 1 test
    
    go.temporal.io/server/service/history/workflow/TestStateBuilderSuite/TestApplyStateMachineEvent/nexus_scheduled,_flag_on,_creates_in_chasm Introduced here