[ci] Skip docs checks on unrelated changes

[ricab]

Addresses #3991.

MULTI-1899

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.27%. Comparing base (f7ba74f) to head (bd106dc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3990   +/-   ##
=======================================
  Coverage   89.27%   89.27%           
=======================================
  Files         259      259           
  Lines       14653    14653           
=======================================
  Hits        13081    13081           
  Misses       1572     1572           

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