Remove unreachable onboarding view code
What does this MR do and why?
Remove unreachable onboarding view code
- welcome page is only reachable via Gitlab.com, see https://gitlab.com/gitlab-org/gitlab/-/blob/53caa2cb049824e38a27c8e93280ace5bba849f8/ee/app/controllers/registrations/welcome_controller.rb#L15, so we can remove the Gitlab.com? conditional and branching for self-managed.
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Edited by Doug Stull