Update url helper to consider ee version

What does this MR do and why?

Describe in detail what your merge request does and why.

• Fix pipeline: https://jihulab.com/gitlab-cn/gitlab/-/pipelines/1108689/failures
• Fix job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/7283457

Changes from Upstream MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116857

Changed default value of help_page_documentation_base_url on ApplicationSetting,

from nil to https://docs.gitlab.com .

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