Update _scopes_form.html.haml to remove duplicate information

What does this MR do?

Cleans up the scopes description display, because it had doubled or tripled information. Discussed with @tauriedavis in the notes for 587afe45.

Are there points in the code the reviewer needs to double check?

Yes, please make sure it displays correctly, I am unable to test this at the moment. It will also be necessary to clean up the full scope descriptions themselves (Read_Repository, Read_Registry, openid). I have no idea where these descriptions are stored, so please tag someone who knows where the scope descriptions are saved.

• Make sure simply deleting the span doesn't screw up the rest of the view
• Assign someone to update the scope descriptions, or link to where the descriptions are stored, so I can attempt to clean them up myself.

Why was this MR needed?

See Screenshots.

Screenshots (if relevant)

Looks like this currently, and note read_repository and read_registry, which is just the same thing three times. The others differ slightly between the short and long descriptions, but the information is basically the same:

I'm hoping it'll look like this when merged (I am unable to test this on my end right now):

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Related to 587afe45, as discussed with @tauriedavis