Fix pairwise_judge to use A/B instead of col_A/col_B. col_A/col_B use 2 tokens, so cascade fails

[harshitgupta412]

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[liana313]

Let's also update CI tests to include the pairwise judge and test for edge cases on this

[liana313]

This is a start, but we need more than one CI test for cascade testing. We should cover edge cases (e.g., when there's an existing col A and col B)