Add fake DCO check for merge queue events

[yurishkuro]

Which problem is this PR solving?

The DCO check does not get triggered from the merge queue.

Description of the changes

• Create a fake DCO check workflow that only runs on merge queue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.61%. Comparing base (966043e) to head (868b3aa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2632   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files         255      255           
  Lines        7738     7738           
  Branches     1988     2004   +16     
=======================================
  Hits         7476     7476           
  Misses        262      262           

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