Merge branch 'custom-models-blueprint' into 'master'

Self-Hosted Model Deployment Blueprint

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148599



Merged-by: Jessie Young <jessieyoung@gitlab.com>
Approved-by: Jessie Young <jessieyoung@gitlab.com>
Approved-by: Igor Drozdov <idrozdov@gitlab.com>
Approved-by: Michelle Gill <mgill@gitlab.com>
Reviewed-by: Jessie Young <jessieyoung@gitlab.com>
Reviewed-by: Shekhar Patnaik <spatnaik@gitlab.com>
Reviewed-by: Susie Bitters <sbitters@gitlab.com>
Co-authored-by: Sean Carroll <scarroll@gitlab.com>