test_simple: fix accidentally skipped test #16777
                
     Merged
            
            
          
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This moves
_update_contextbelowtest_with_files_quarantined_omitted_from_indexand into a proper indentation, unskippingtest_with_files_quarantined_omitted_from_indexin the progress. I'm a little surprisedtest_with_files_quarantined_omitted_from_index's skippage wasn't caught by any dead code/unreachability checks 🤔To get
test_with_files_quarantined_omitted_from_indexpassing, I cargo-culted changed based on the other test changes made in #15716.CC @ewdurbin @cofiem
See #15716 (review)