Make onboarding optional, able to be ignored on desktop (take 2) (#6628)

* 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

* Make utility to verify a string is an onboarding value

* Little biome formatting suggestion fix

* Units onboarding step was not using OnboardingButtons

* Add type checking of next and previous status, fix useNextClick

* Thanks Graphite Diamond, I should use that new util

* Remove TODO comment

* Fix botched merge because IS_PLAYWRIGHT moved or something

---------

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

src/lib/routeLoaders.ts

@@ -22,12 +22,6 @@ import type {
 } from '@src/lib/types'
 import { settingsActor } from '@src/lib/singletons'
 
-export const telemetryLoader: LoaderFunction = async ({
-  params,
-}): Promise<null> => {
-  return null
-}
-
 export const fileLoader: LoaderFunction = async (
   routerData
 ): Promise<FileLoaderData | Response> => {