Remove qa create_or_import.rb

What does this MR do and why?

Fix job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/14178456

Upstream 在 merge_requests/152098 删除了 learn_gitlab/onboarding.html.haml 文件，对应的测试也删掉了。极狐这边同样删除测试文件。 /cc @WilsonDuan

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