Update ui-box, rip out `glamor` where possible

[brandongregoryscott]

Overview

This PR updates our ui-box version to 5.2.1, which includes the ability to define selectors! Unfortunately it looks like most of the glamor references are related to keyframes / animations, which we don't have support for yet. This is step 1 of hopefully 2 for ripping out glamor!

Screenshots (if applicable)

The stories for each component (Avatar, Badge, SearchTableHeaderCell, and Toast) that was changed can be used to verify the changes haven't had a visual/functional regression.

~Update: looks like the style prop is broken now, which breaks the Avatar and the layout of the Badge stories. Holding off until https://github.com/segmentio/ui-box/issues/120 is fixed.~ Fixed!

Documentation

• [ ] Updated Typescript types and/or component PropTypes
• [ ] Added / modified component docs
• [ ] Added / modified Storybook stories

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