Migrate cancel button iin shared/notes/form

What does this MR do and why?

Migrate cancel button in shared/notes/form

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Go to commit
• Start a new thread
• Click input to reply to thread
• Observe Cancel button

UX Paper Cuts 16.5 → Cleanup (#424403 - closed)

Related to #417854 (closed)