ci: use ansys/action/hk-automerge-prs

[RobPasMue]

Description

Remove existing automerge workflow in favor of dedicated action

Issue linked

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.71%. Comparing base (cf3970e) to head (7fd3b51).
Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (88.71%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1824   +/-   ##
=======================================
  Coverage   88.71%   88.71%           
=======================================
  Files          92       92           
  Lines        8559     8559           
=======================================
  Hits         7593     7593           
  Misses        966      966           

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