Draft: User saved replies

What does this MR do and why?

This creates the frontend to allow users to create, edit, and delete saved replies. These saved replies can then be used inside of issues, merge requests, and epics.

NOTE This is a larger merge request that will be split up.

#14328 (closed)

Screenshots or screen recordings

Screen_Recording_2022-11-17_at_14.28.44

Screen_Recording_2022-11-15_at_12.38.54

How to set up and validate locally

• Enable the saved_replies feature flag
• Visit /-/profile/saved_replies/ to create a new saved reply
• Visit any issue, merge request, or epic and click the saved replies dropdown button to add saved reply to comment box

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.