Narrow AdvancedCollectionView trimming warning so that it only triggers in unsafe usages

[sylveon]

Fixes

Fixes #723

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

Trimming warning triggers on every usage of AdvancedCollectionView

What is the new behavior?

Trimming warning only triggers when you make use of reflection-based sorting.

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• [x] Based off latest main branch of toolkit
• [x] Tested code with current supported SDKs
• [ ] New component
  • [ ] Documentation has been added
  • [ ] Sample in sample app has been added
  • [ ] Analyzers are passing for documentation and samples
  • [ ] Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• [ ] Tests for the changes have been added (if applicable)
• [x] Header has been added to all new source files
• [x] Contains NO breaking changes

Other information