ci(labels): label strategy for changelog fragments

[jorgepiloto]

This pull-request adds two new labels named docs:changelog and docs:changelog:skip. The first one does not have any consequence other than information. The last one has an impact in CI/CD. If set, no fragment is generated.

[duposyl]

LGTM! Thanks!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (755a931) to head (6bf37dc).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #872   +/-   ##
=======================================
  Coverage   89.65%   89.65%           
=======================================
  Files          66       66           
  Lines      188712   188712           
  Branches     1360     1360           
=======================================
  Hits       169198   169198           
  Misses      19122    19122           
  Partials      392      392           

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