Migrate all Gcloud k8s clusters setup to use k3s for monitor end to end tests

Currently, the service provider used for Monitor end-to-end tests is Google Cloud

@cluster = Service::KubernetesCluster.new.create!

We should be migrating the monitor tests to use the most efficient alternative now available

Service::KubernetesCluster.new(provider_class: Service::ClusterProvider::K3s).create!

This will require to refactor in specs in both ee and non-ee features_browser_ui_8_monitor

The overall setup of a fully ready project to monitor (cluster setup + pipeline ) is at 12 minutes. We should observe a decrease of this time.