#7599594 Add two new solutions to the cancellation flow

Proposed Changes

• This PR adds two new solutions – Live Chat and Built By – to the cancellation flow and also applies fresh visual styles to the flow as a part of the Cancelation Reason/Solutions project. For more details, see pebzTe-kL-p2

Testing Instructions

• Try to cancel/remove your paid plan.
• You would be taken to the solutions based on the reason you picked. Visit pebzTe-nt-p2 to see the reasons and the relevant solutions. For example, you will see the Downgrade to Monthly Plan solution when you choose Price/Budget > It's too expensive.
  
  
• Make sure the buttons work properly.

Pre-merge Checklist

• 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 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)?

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