fix(mysql): qualify column names on both sides of comparison operators

[kmirzavaziri]

Fixes #3494

Bug: MySQL WHERE clause column qualification fails when column is on right side of comparison operator.

Changes:

• Refactored MySQL column qualification to handle columns on both sides of comparison
• Added test cases for column position variations
• Matches PostgreSQL behavior which already handles both sides correctly

Test Plan:

• Added test cases for MySQL column qualification on both left and right sides

[vercel]

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