Refactor trial page to minimal
Background
ee/views/trials/new.html.haml recently changed and jh/views/trials/new.html.haml cause a error since the diveraged.
See https://gitlab.com/gitlab-jh/customers-gitlab-cn/-/issues/95#note_655888106
Fix
This MR split the minimal change from upstream to jh. So JH can just override the two lines of minimal change instead of the entire page.
Keep the change minimal to make sure the affect minimal.
Upstream MR
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68733
CC: @JeremyWuuuuu @jh-deng @qianzhangxa
由 Qian Zhang (Gary) 编辑于