e2e test that creates GKE cluster with default settings

[IsaSih]

Summary

Occurred changes and/or fixed issues

This PR addresses the issue rancher/qa-tasks#1571.
This is a single e2e test that creates a GKE cluster with the default settings and verifies that the cluster is created and that the GKE default version and zone are displayed in the UI elements as expected. To support the test, were created GKE-related page objects for the GKE Create cloud credentials page, the GKE authenticate page with Project ID, and the Create GKE Cluster Page.

Some methods and variables were created but are not being used in this single test. Still, they will be used for the upcoming tests.

Storing the GKE Cloud credentials will be addressed in another PR.

Areas or cases that should be tested

Create a GKE Cluster with default settings
Other cluster provisioning-related tests
Other cloud credentials creation related tests
Other pages that contain LabeledInput or LabeledSelect elements

Areas which could experience regressions

other cluster provisioning tests

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[IsaSih]

@richard-cox could you please give an update on the review? Thanks