CI: Add a job that runs when all required status checks pass

[str4d]

This enables us to add a single "required status check" to the GitHub repo settings, that covers all required matrix job cases.

[nuttycom]

utACK e81ee7a

[nuttycom]

utACK 56fa0b8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.31%. Comparing base (b78a91f) to head (56fa0b8).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1594   +/-   ##
=======================================
  Coverage   56.31%   56.31%           
=======================================
  Files         148      148           
  Lines       19026    19026           
=======================================
+ Hits        10714    10715    +1     
+ Misses       8312     8311    -1     

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