Revert rebase without pipeline to skip refreshing external status check

What does this MR do and why?

Revert rebase without pipeline to skip refreshing external status check

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/11134682

Broken by upstream MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/133383

Because rebase without pipeline(MR here) is temp solution for squash merge feature, and the latter has been used in BiRen customer, and the former is not used in any customer else now, so we could revert the former to keep the code clean. If needed in the future, we can revert this commit easy.

Above fix has been discussed and confirmed by @lpeng1991 @icbd @chaomao @xfyuan