Fixed assets loading performance in 3.2.13

The PR #8756 uses Sprockets for resolving files that already exists on disk, for those files their extensions don't need to be rewritten.

Fixes #9803
Added changelog for 687e68d
Merge branch '3-2-stable' into fredwu-slow_view_loading_fix

* 3-2-stable:
  Merge pull request #9802 from newsline/fix-broken-action-missing
  Remove bad changelog entry from AR [ci skip]
  Wrong exception is occured when raising no translatable exception
  Don't crash exception translation w/ nil result attribute.

Conflicts:
	actionpack/CHANGELOG.md