ci: Enforce conventional commits

[ChristophWurst]

stable5.0 is clean for #6507 but we should try to enforce the commit style in this repo too.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.43%. Comparing base (6e06e87) to head (4d46142).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6508   +/-   ##
=========================================
  Coverage     23.43%   23.43%           
  Complexity      453      453           
=========================================
  Files           247      247           
  Lines         11724    11724           
  Branches       2223     2224    +1     
=========================================
  Hits           2748     2748           
  Misses         8656     8656           
  Partials        320      320           

Flag	Coverage Δ
javascript	15.03% <ø> (ø)
php	59.29% <ø> (ø)

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