Delete actionlint config

[martincostello]

Made redundant by #2729.

[Copilot]

Pull Request Overview

This PR removes the actionlint configuration file that has become redundant due to changes made in PR #2729.

• Deletes the entire .github/actionlint.yml configuration file
• Removes the ignore rule for the "unknown permission scope models" warning in the moderation workflow

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.12%. Comparing base (d22d6a8) to head (75898be).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2730   +/-   ##
=======================================
  Coverage   96.12%   96.12%           
=======================================
  Files         309      309           
  Lines        7118     7118           
  Branches     1008     1008           
=======================================
  Hits         6842     6842           
  Misses        222      222           
  Partials       54       54           

Flag	Coverage Δ
linux	96.12% <ø> (ø)
macos	96.12% <ø> (ø)
windows	96.11% <ø> (ø)

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