Keep selected visibility level in new project form

What does this MR do?

Keep the project visibility level selected in case of error creating the project.

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

Maybe the view tests, since it's my first contribution.

Why was this MR needed?

It's an usability issue to reset the form in case of error; users are likely to forget reviewing the visibility level again.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #19253 (closed): visibility level reset to default on form error