Remove column ignore rules for migrated PKs

What does this MR do and why?

This MR removes column ignore rules for the following tables:

• ci_builds
• ci_builds_metadata
• ci_job_artifacts
• ci_sources_pipelines
• events
• push_event_payloads
• taggings

All columns were removed in 14.4.

We also remove IgnorableColumns module for models that no more have columns ignored, and had rules removed with !71161 (merged).

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.