Add testacc for karbon resources and data sources

[marinsalinas]

No description provided.

[yannickstruyf3]

@marinsalinas Can we check more attributes (name, deployment_type, kubeapi_server_ipv4_address,...) in the acc tests?

[yannickstruyf3]

Can we also add a test for a different CNI? This be done by changing "flannel" to Calico

[yannickstruyf3]

Scale-up/down should also be part of the test cases.
Changing the local.amount_of_workers parameter to a higher value will trigger scale up. Setting a lower value will trigger scale down.