Fix engine connection break when starting onboarding from a fresh install (#4263)

* Make electron test setting overrides not entirely replace default settings

* Add failing test

* Fix test by checking for healthy engine connection before executing demo code

* Fix one electron test that assumed all settings got wiped if you override any.

* 🤷🏻‍♂️ an engine-side camera position in one of the E2E tests changed by 0.01 randomly

e2e/playwright/testing-settings.spec.ts

@@ -430,7 +430,6 @@ test.describe('Testing settings', () => {
       await test.step('Check color of logo changed when in modeling view', async () => {
         await page.getByRole('button', { name: 'New project' }).click()
         await page.getByTestId('project-link').first().click()
-        await page.getByRole('button', { name: 'Dismiss' }).click()
         await changeColor('58')
         await expect(logoLink).toHaveCSS('--primary-hue', '58')
       })