Prepare command bar to support modeling commands (#1184)

* Tweak toaster look and feel

* Add icons, tweak plus icon names

* Rename commandBarMeta to commandBarConfig

* Refactor command bar, add support for icons

* Create a tailwind plugin for aria-pressed button state

* Remove overlay from behind command bar

* Clean up toolbar

* Button and other style tweaks

* Icon tweaks follow-up: make old icons work with new sizing

* Delete unused static icons

* More CSS tweaks

* Small CSS tweak to project sidebar

* Add command bar E2E test

* fumpt

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* fix typo in a comment

* Fix icon padding (built version only)

* Update onboarding and warning banner icons padding

* Misc minor style fixes

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/components/NetworkHealthIndicator.test.tsx

@@ -1,5 +1,4 @@
 import { fireEvent, render, screen } from '@testing-library/react'
-import UserSidebarMenu from './UserSidebarMenu'
 import { BrowserRouter } from 'react-router-dom'
 import { GlobalStateProvider } from './GlobalStateProvider'
 import CommandBarProvider from './CommandBar'