tests: use existing resources and test DA directly

[jor2]

Description

The code in https://github.com/terraform-ibm-modules/terraform-ibm-cloudpak-data is only a DA (no module). The DA contains a provider configuration and is not compatible with the for_each, count, and depends_on arguments, hence should not be consumed the way it is in the basic example. So we should remove the basic example and instead update the tests to directly test the DA code.

To do this, we will need to have code in the tests folder to provision the pre-req cluster (same way we do in other DA tests when working with existing resources).
I also notice the DA is not locked into exact provider versions. We should lock into an exact version to ensure consistency.

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