Fix: override subscription links at admin page

What does this MR do and why?

Related to https://jihulab.com/gitlab-cn/gitlab/-/issues/3006+

Override button links for in /admin/subscription page

Screenshots or screen recordings

No Change, Only change the url

How to set up and validate locally

1. Login as Admin user

2. enter /admin/subscription page

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.