Bug 2004156 - Add the mozharness framework as an available option.

[kala-moz]

This PR adds the missing framework 18, mozharness. It was missing according to Bug 20004156.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.35%. Comparing base (f3ed4db) to head (2ff49ef).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #986   +/-   ##
=======================================
  Coverage   96.35%   96.35%           
=======================================
  Files         104      104           
  Lines        3015     3015           
  Branches      686      686           
=======================================
  Hits         2905     2905           
  Misses        109      109           
  Partials        1        1           

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[gmierz]

@kala-moz can you rework your PR title? It looks a bit off at the moment. I recommend using something like Bug 2004156 - Add the mozharness framework as an available option.