Merge branch '451588-move-loader-to-base' into 'master'

Move VSA loading state out of the empty state component

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184173



Merged-by: Andrew Fontaine <afontaine@gitlab.com>
Approved-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Approved-by: Andrew Fontaine <afontaine@gitlab.com>
Reviewed-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Co-authored-by: Alex Pennells <apennells@gitlab.com>