Dropping ignored repositories columns from geo_node_statuses

What does this MR do and why?

This MR removes repositories columns that were out of use and ignored in %16.6 .

These were used in legacy Geo replication.

Related issue: #426645 (closed)

Dropping ignored repositories columns from geo_node_statuses table

Changelog: other

How to set up and validate locally

Run bin/rails db:migrate

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

Related to #426645 (closed)