Make permissions.rb autoloadable

[mamhoff]

What is this pull request for?

CanCan abilities can be autoloaded and are only necessary at runtime. No need to load them on startup.

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have added tests to cover this change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.13%. Comparing base (1c4ac02) to head (411eda9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3419      +/-   ##
==========================================
- Coverage   97.13%   97.13%   -0.01%     
==========================================
  Files         279      279              
  Lines        7366     7365       -1     
==========================================
- Hits         7155     7154       -1     
  Misses        211      211              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[tvdeyen]

@mamhoff does this need to be backported to 8.0 or is this fine as is and just an optimisation?

[mamhoff]

This is really an optimisation. No need to backport.