Update saved reply form layout

What does this MR do and why?

• Updates layout of Saved replies form
• Moves saved reply actions into dropdown

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Enable feature flag :saved_replies
• Go to user preferences > Saved replies

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

#394879 (closed)