Rollback to the gitlab internal purchase flow for JH

What does this MR do and why?

Rollback to the gitlab internal purchase flow for JH

Related issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/4589

Upstream switch to whole new CDot purchase flow, but JH still need to use the internal purchase flow for a while

Upstream related MR:

• https://gitlab.com/gitlab-org/gitlab/-/merge_requests/170411
• https://gitlab.com/gitlab-org/gitlab/-/merge_requests/171686