E2E updates after Firebase changes

[tormoseng]

• Updates on Firebase requests from https://github.com/AtB-AS/webshop/pull/452
• Added check if config is loaded from Firestore before continuing
• Remove SRI-hashes for Cypress with "experimentalSourceRewriting" (ref https://github.com/cypress-io/cypress/issues/2393)
• Remove comments related to fixed bugs
• Include extra check on onboarding after fix on "Next" vs "Skip"
• Remove error-check on editing phone numers as this is fixed

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e970761):

https://atb-webshop-staging--pr453-tor-e2e-update-after-md56ea6l.web.app

_{(expires Sat, 18 Dec 2021 08:54:04 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[tormoseng]

Test OK: https://github.com/AtB-AS/webshop/actions/runs/1586626811