Fix Lint/RedundantCopDisableDirective offenses
What does this MR do and why?
Fix Lint/RedundantCopDisableDirective offenses
The cop is enabled in grace period.
We're getting most of these offenses because the Migration/AddColumnsToWideTables cop was recently renamed to Migration/PreventAddingColumns in db551f89.
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Related to #376133 (closed)