Non-deterministic pivot table code

[aarondr77]

1. Run the test test_all_edits_optimized_after_import_pivot and see that it sometimes passes and sometimes fails because it sometimes generates: tmp_df = test[[\'B\', \'A\']].copy() and other times generates tmp_df = test[[\'A\', \'B\']].copy()

https://github.com/mito-ds/mito/assets/18709905/870894e9-2c69-421e-a924-5bd596ffce8c