Ignore next_min_cursor - BBO

Ref: #578993 (closed)

What does this MR do and why?

This MR ignores next_min_cursor on background_operation_workers & background_operation_workers_cell_local tables which we are not planning to use anymore.

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