Ignoring column ci_active_pipelines from PlanLimits

What does this MR do and why?

Following: https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#ignoring-the-column-release-m

Ignoring column ci_active_pipelines which is deprecated.

All the other code was removed part of: !117951 (merged)

Screenshots or screen recordings

N/A

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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 #408141 (closed)