.github: add merge_group trigger for merge queue

[MSevey]

Overview

In order to run the CI when the PRs are in the merge queue we need to add the merge_group trigger to the CI. This PR is a blocker to using the merge queue.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -1.96 ⚠️

Comparison is base (8b1f9b4) 56.17% compared to head (7af9b28) 54.21%.

❗ Current head 7af9b28 differs from pull request most recent head a66276c. Consider uploading reports for the commit a66276c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #972      +/-   ##
==========================================
- Coverage   56.17%   54.21%   -1.96%     
==========================================
  Files          68       54      -14     
  Lines       10915     6032    -4883     
==========================================
- Hits         6131     3270    -2861     
+ Misses       3901     2412    -1489     
+ Partials      883      350     -533     

see 38 files with indirect coverage changes

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