Merge branch 'pedropombeiro/493256/add-sharding_key_id-to-ci_runners' into 'master'

Add sharding_key_id to ci_runners table

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166916



Merged-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Approved-by: Corinna Gogolok <cgogolok@gitlab.com>
Approved-by: Rodrigo Tomonari <rtomonari@gitlab.com>
Approved-by: Krasimir Angelov <kangelov@gitlab.com>
Approved-by: Tianwen Chen <tchen@gitlab.com>
Reviewed-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Reviewed-by: Krasimir Angelov <kangelov@gitlab.com>
Reviewed-by: Corinna Gogolok <cgogolok@gitlab.com>
Reviewed-by: Rodrigo Tomonari <rtomonari@gitlab.com>