Added edit form to saved replies

What does this MR do and why?

Added edit form to saved replies list items.

Screenshots or screen recordings

How to set up and validate locally

• Enable saved_replies feature flag
• Visit /-/profile/saved_replies/
• Create a saved reply
• Edit that saved reply

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.

#355845 (closed)