Intent of admitting_update_#1_is_allowed

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
    
    workflow/ 2 tests
    
    update/ 2 tests
    
    TestFindOrCreate/ 2 tests
    
    enforce_inflight_update_size_limit/ 2 tests
    
    go.temporal.io/server/service/history/workflow/update/TestFindOrCreate/enforce_inflight_update_size_limit/admitting_update_#1_is_allowed Introduced here
    
    go.temporal.io/server/service/history/workflow/update/TestFindOrCreate/enforce_inflight_update_size_limit/increasing_limit_allows_update_#3_to_be_admitted Inherited increasing_limit_allows_update_#3_to_be_admitted