Resolves DOTDASH-368

Proposed Changes

• This PR fixes the validation message for the Name Server field. It now shows the proper message when the field value is invalid.
• It also fixes the suffix looking bad when the domain name is too long.
• Refactors the SuffixInputControl component to use the newly exposed ValidatedInputControl.

As discussed here, this is using an experimental component, which may change in the future. This makes testing even more important, so I'm suggesting focusing on that next - DOTDASH-387.

Before:

After:

Why are these changes being made?

• This improves the UX and looks of the screen.

Testing Instructions

• Go to http://calypso.localhost:3000/v2/domains/[domain]/glue-records/add and try entering an invalid name server.
• You should see an error message.
• Enter valid values and make sure the form can be submitted as expected.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you tested accessibility for your changes? Ensure the feature remains usable with various user agents (e.g., browsers), interfaces (e.g., keyboard navigation), and assistive technologies (e.g., screen readers) (PCYsg-S3g-p2).
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?