Use Rack::Utils.clean_path_info instead of copy-pasted version.

What does this MR do?

This merge request removes copy-pasted from ActionDispatch::FileHandler clean_path_info method in favor of Rack::Utils.clean_path_info.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content