chore: Build a jest based integration test to ensure that a provisioner works

[nsainaney]

Background:

As our library grows, we are going to need to have automated tests for our provisioners. This task is to prove that it can be done.

Requirements:

• Brush up on how jest unit tests work
• Manually set up a k8s cluster and set KUBECONFIG to point to the config file. Alternatively, the jest test can assume that a test-kubeconfig.yaml is at a predefined location.

The test itself will:

• The test will call provisionerManager.perform(appResource, 'create', answers) so the test can run silently
• Use kubeclient to wait for certain components (pods, services etc) to be created
• Time out after a configurable amount of time (jest has built in timeouts)
• Call provisionerManager.perform(appResource, 'remove', answers) to uninstall the app
• Check that resources are removed