Intent of nil_allowed:_nil_with_mask_clears_the_TSC

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
    
    api/ 1 test
    
    updateworkflowoptions/ 1 test
    
    TestMergeAndApply/ 1 test
    
    go.temporal.io/server/service/history/api/updateworkflowoptions/TestMergeAndApply/nil_allowed:_nil_with_mask_clears_the_TSC Introduced here