Intent of past_target_disables_as_a_bare_signal

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
    
    TestTimeSkippingTransition/ 1 test
    
    fast-forward_fallback_and_gating/ 1 test
    
    go.temporal.io/server/service/history/workflow/TestTimeSkippingTransition/fast-forward_fallback_and_gating/past_target_disables_as_a_bare_signal Introduced here