Add ci-template-check.yml

[trexfeathers]

For detailed context, see the following:

• Add ci-template-check.yml workflows#115
• Script to make PR authors aware if they are modifying templated files .github#41

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.80%. Comparing base (eea55d6) to head (23e5eb6).
Report is 77 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6377   +/-   ##
=======================================
  Coverage   89.80%   89.80%           
=======================================
  Files          90       90           
  Lines       23752    23752           
  Branches     4418     4418           
=======================================
  Hits        21331    21331           
  Misses       1672     1672           
  Partials      749      749           

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[ESadek-MO]

LGTM, thanks @trexfeathers! Just respinning to fix linkcheck