[CI] Add paths filters (backport #503)

[mergify]

as we have in ros2_control repo

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This is an automatic backport of pull request #503 done by Mergify.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.35%. Comparing base (9c83f1f) to head (9b9e5c8).

Additional details and impacted files

@@           Coverage Diff           @@
##            jazzy     #505   +/-   ##
=======================================
  Coverage   78.35%   78.35%           
=======================================
  Files          28       28           
  Lines        2194     2194           
  Branches      130      130           
=======================================
  Hits         1719     1719           
  Misses        402      402           
  Partials       73       73           

Flag	Coverage Δ
unittests	78.35% <ø> (ø)

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