Describe the bug

• Posthumously filing to track fix: validate inter-file ordering in eq_properties() #20329

TLDR: just because the files themselves are sorted doesn't mean the partition streams are sorted.

• eq_properties() in FileScanConfig blindly trusted output_ordering (set from Parquet sorting_columns metadata) without verifying that files within a group are in the correct inter-file order
• EnforceSorting then removed SortExec based on this unvalidated ordering, producing wrong results when filesystem order didn't match data order

To Reproduce

No response

Expected behavior

No response

Additional context

No response