Merge branch 'update-machine-blueprint' into 'master'

Add separation of concerns to Next Runner blueprint.

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/97893



Merged-by: Grzegorz Bizon <grzegorz@gitlab.com>
Approved-by: Grzegorz Bizon <grzegorz@gitlab.com>
Co-authored-by: Joseph Burnett <jburnett@gitlab.com>