Ignore sharding_key_id column on runner-related models
What does this MR do and why?
This MR ignores the sharding_key_id column on runner-related models, after the check constraints were removed in %18.3 by #557226 (closed). This corresponds to milestone M in https://docs.gitlab.com/development/database/avoiding_downtime_in_migrations/#ignoring-the-column-release-m.
Changelog: other
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Edited by Pedro Pombeiro