feature: Add WorkflowGlobalTransaction.Exists method

[wooln]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.18%. Comparing base (16f174d) to head (868d851).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #102   +/-   ##
=======================================
  Coverage   70.18%   70.18%           
=======================================
  Files          45       45           
  Lines        1999     1999           
  Branches      196      196           
=======================================
  Hits         1403     1403           
  Misses        558      558           
  Partials       38       38           

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