Merge branch '467972-vreg-db-models-part-1' into 'master'

Add models for Virtual Registries, part 1/2

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/156930



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Moaz Khalifa <mkhalifa@gitlab.com>
Approved-by: Greg Myers <gmyers@gitlab.com>
Approved-by: Aakriti Gupta <agupta@gitlab.com>
Approved-by: Jon Jenkins <jjenkins@gitlab.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Reviewed-by: Michał Zając <mzajac@gitlab.com>
Reviewed-by: Jarka Košanová <jarka@gitlab.com>
Reviewed-by: David Fernandez <dfernandez@gitlab.com>
Reviewed-by: Aakriti Gupta <agupta@gitlab.com>
Reviewed-by: Moaz Khalifa <mkhalifa@gitlab.com>
Co-authored-by: David Fernandez <dfernandez@gitlab.com>