Make onboarding optional, able to be ignored on desktop (#6564)

* Remove unused `telemetryLoader`

* Remove onboarding redirect behavior

* Allow subRoute to be passed to navigateToProject

* Replace warning dialog routes with toasts

* Wire up new utilities and toasts to UI components

* Add home sidebar buttons for tutorial flow

* Rename menu item

* Add flex-1 so home-layout fills available space

* Remove onboarding avatar tests, they are becoming irrelevant

* Consolidate onboarding tests to one longer one

and update it to not use pixel color checks, and use fixtures.

* Shorten warning toast button text

* tsc, lint, and circular deps

* Update circular dep file

* Fix mistakes made in circular update tweaking

* One more dumb created circular dep

* Update src/routes/Onboarding/utils.tsx

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

* Fix narrow screen home layout breaking

* fix: kevin, navigation routes fixed

* fix: filename parsing is correct now for onboarding with the last file sep

* Fix e2e test state checks that are diff on Linux

* Create onboarding project entirely through systemIOMachine

* Fix Windows path construction

---------

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
Co-authored-by: Kevin Nadro <kevin@zoo.dev>

src/routes/utils.ts

@@ -1,7 +1,7 @@
 import { NODE_ENV } from '@src/env'
 import { isDesktop } from '@src/lib/isDesktop'
 
-import { IS_PLAYWRIGHT_KEY } from '@e2e/playwright/storageStates'
+import { IS_PLAYWRIGHT_KEY } from '@src/lib/constants'
 
 const isTestEnv = window?.localStorage.getItem(IS_PLAYWRIGHT_KEY) === 'true'