[onboarding] e2e automation testing

automation case：

1. registered user
2. finish the signup process
3. create new groups and project
4. nav to the ci onboarding page
5. jump in to Learn the GitLab project
6. followed by the ci guide step by step
7. close the issue.

added to epic &5377

@leiqi_jihulab，请添加类型标记：

• typebug：已发布或上线的产品中所出现的缺陷。这种类型的 issue 需在 QA 验证过后才可以关闭，而下面其它类型的 issue 在相关的 merge request (MR) 合并后即可关闭。
• typefeature：对于用户可见的新功能或对现有功能的改进。
• typemaintenance：非用户可见的产品改进，如：解决之前的技术债。
• ~"type::qa"：测试相关的工作。
• ~"type::report"：用于标记 Triage 自动生成的里程碑回顾报表。

或者你也可以直接添加子类型标记（例如 featureenhancement），我们会自动补全上述标记。要详细了解标记，请查阅文档：极狐 Handbook。

assigned to @leiqi_jihulab

added workflowin qa label

changed milestone to %15.6

added #2032 (closed) as child task

changed title from [onboarding]automation to [onboarding] e2e automation testing

added #2033 (closed) as child task

changed the description

added 1 deleted label

already finished the e2e script. so close it.

closed

added 1 deleted label and removed workflowin qa label