Merge branch '497750-move-purchase-flow-components-to-subscriptions' into 'master'

Move purchase_flow components to subscriptions

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/171052



Merged-by: Andrew Fontaine <afontaine@gitlab.com>
Approved-by: Lindsey Shelton <lshelton@gitlab.com>
Approved-by: Andrew Fontaine <afontaine@gitlab.com>
Co-authored-by: Ezekiel Kigbo <ekigbo@gitlab.com>