Emails page redesign

Created by: artemruts

Fixes #15409

Reworked Setting/Emails page, removed FilteredConnection and hopefully simplified a few things. There's a "Set primary address" select now, ty @ryanslade. A 80% of the time I spend recalling React.

CSS:

• Maybe select element can have fixed(-ish) width?
• Replace filtered-connection styles, what approach should I take?
• Not sure why modal looks that way, why did we set width: 32 rem?

@quinnkeast some of the styles are definitely not 1 to 1 as in Figma, which elements stand out to you the most?