ci: Disable "validate pull request" workflow for release pull requests

[Mrtenz]

The "validate pull request" workflow checks if the pull request title matches the conventional commits syntax. Unfortunately "release: version" doesn't seem to be considered as valid, so instead, we should disable the check for release pull requests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.03%. Comparing base (81c33fd) to head (6e71e94).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3346   +/-   ##
=======================================
  Coverage   98.03%   98.03%           
=======================================
  Files         402      402           
  Lines       11112    11112           
  Branches     1754     1754           
=======================================
  Hits        10894    10894           
  Misses        218      218           

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