Intent of an_earlier_fast-forward_wins_over_a_later_tracked_target_and_disables

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
    
    workflow/ 3 tests
    
    TestTimeSkippingTransition/ 3 tests
    
    fast-forward_fallback_and_gating/ 3 tests
    
    go.temporal.io/server/service/history/workflow/TestTimeSkippingTransition/fast-forward_fallback_and_gating/an_earlier_fast-forward_wins_over_a_later_tracked_target_and_disables Introduced here
    
    go.temporal.io/server/service/history/workflow/TestTimeSkippingTransition/fast-forward_fallback_and_gating/taken_as_the_target_and_disables_when_nothing_earlier_exists Inherited target_equal_to_current_disables_and_sets_the_target, taken_as_the_target_and_disables_when_nothing_earlier_exists
    
    go.temporal.io/server/service/history/workflow/TestTimeSkippingTransition/fast-forward_fallback_and_gating/target_equal_to_current_disables_and_sets_the_target Inherited target_equal_to_current_disables_and_sets_the_target, taken_as_the_target_and_disables_when_nothing_earlier_exists