Adds migration to ensure all remote mirror columns get created

Tiago Botelho requested to merge ensure-remote-mirror-columns-in-ce into master

What does this MR do?

If a user migrated from EE to CE before every needed column for remote mirrors got created we would have an incomplete remote_mirrors table. This MR adds a migration to fix that problem.

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #46775 (closed)

Edited by Douwe Maan

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