Fix: pipeline failure with signup pages

What does this MR do and why?

Upstream MR were located https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118831.

In this MR they changed the way of rendering the content by content_for and yield syntax.

Related pipeline failure https://jihulab.com/gitlab-cn/gitlab/-/pipelines/1214855/failures.

Describe in detail what your merge request does and why.

Fix: pipeline failure with signup pages

• Fix signup page testing issue based on upstream changes.

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