Intent of basic:_fast-forward_from_nil

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 2 tests
- server/ 2 tests
  - service/ 2 tests
    
    history/ 2 tests
    
    api/ 2 tests
    
    updateworkflowoptions/ 2 tests
    
    TestMergeAndApply/ 2 tests
    
    go.temporal.io/server/service/history/api/updateworkflowoptions/TestMergeAndApply/basic:_fast-forward_from_nil Introduced here
    
    go.temporal.io/server/service/history/api/updateworkflowoptions/TestMergeAndApply/reapply:_TSC_updated_with_same_fast-forward Inherited reapply:_TSC_updated_with_same_fast-forward