[e2e] Refactor onboarding tests (metamask-ui.spec.js)

[david0xd]

e2e test suite refactoring as part of the https://github.com/MetaMask/metamask-extension/issues/11136

This ticket should cover two batches of the tests identified by describe block in the current code within metamask-ui.spec.js file:

1. Going through the first time flow
2. Import Secret Recovery Phrase

AC:

• Migrate e2e tests so that they use fixtures to set up test state, and test specific pieces of functionality in isolation.
• Separate onboarding (Going through the first time flow) tests into a new file onboarding.spec.js.
• The import test should live in test/e2e/tests/from-import-ui.spec.js along with the other import tests.

Notes:

• Currently each tests in the metamask-ui.spec.js depend on the previous one. When migrating the tests we’re moving away from this pattern by setting up the state of the extension using fixtures which live here test/e2e/fixtures.

[david0xd]

This one should wait a little bit more until we get more clarified situation with Onboarding V2.

[bschorchit]

This one should wait a little bit more until we get more clarified situation with Onboarding V2.

Onboarding V2 is paused until MV3 work is completed. This ticket is not a priority at this time.