🌱 (chore): optimize CI time and usage of resources

[camilamacedo86]

• Move the tests that do not require running on the cluster to run in the job pull-kubebuilder-test just once
• Change TestContext to work well outside of the cluster (it tries to capture the Kubernetes version so we have it tracked in case we want to skip a test for a specific version)
• Update e2e tests to move grafana and alphagenerate to run on this job, since they do not require a cluster
• Improve e2e tests for alpha generate by reducing the number of mocks — we don’t need one mock per plugin; we can use a single mock with all plugins scaffolded to validate properly. This should significantly reduce the time needed to perform the tests

We can check that the tests were executed here: https://storage.googleapis.com/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kubebuilder/4921/pull-kubebuilder-test/1943729959755321344/build-log.txt

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86

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[vitorfloriano]

LGTM