Resolve Cop/IgnoredColumns offenses in sliding_list_strategy_spec.rb

Arpit Tripathirequested to merge
gitlab-community/gitlab-org/gitlab:rubocop-cleanup-ignored-columns into master

What does this MR do and why?

Resolve Cop/IgnoredColumns offenses in sliding_list_strategy_spec.rb

This MR replaces direct assignments to ignored_columns with the ignore_column helper using remove_never: true, as these are temporary test models in specs.

Related to #592383 (closed)

Edited by Lorena Ciutacu

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