Geo - Drop original columns used to store the verification state

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Problem

As part of the effort to split the verification details for the replicates using the same table to store the verification stat (4) into separate tables, we finalized the backfilling and ignored the original database columns in #515874. Now we can safely remove the original database columns, as described in our guides.

Replicable Models using the same table to store the verification state:

• Ci::PipelineArtifact
• Packages::PackageFile
• SnippetRepository
• Terraform::StateVersion

Proposal

1. Drop the original columns following our guides our guides.