feat: add acceptSourceChanges flag to Merge Branch operation.

[Besomhead]

Closes #339.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.12%. Comparing base (c853b46) to head (99189b8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #342   +/-   ##
=========================================
  Coverage     93.12%   93.12%           
  Complexity      892      892           
=========================================
  Files           201      201           
  Lines          3182     3182           
  Branches         70       70           
=========================================
  Hits           2963     2963           
  Misses          183      183           
  Partials         36       36           

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[andrii-bodnar]

@Besomhead thank you!