Fix pre-main-jh pipeline 2024-04-25

What does this MR do and why?

Fix pre-main-jh pipeline 2024-04-25

Failed job

https://jihulab.com/gitlab-cn/gitlab/-/jobs/13917958

Broken by upstream MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148009

which removed the backend code that is related to the migration of the container registry for Gitlab.com, so skip it in JH.

Failed job

https://jihulab.com/gitlab-cn/gitlab/-/jobs/13918095

Broken by upstream MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150017

they switched to only show project limits alert on affected project,

so remove JH override spec and use upstream's spec is OK.