nixos/tests/rancher: merge auto deploy and configuration tests

Each rancher test needs to set up a cluster from scratch. This costs, at
least on my hardware, a lot of time and resources while the actual test
only needs seconds. This merges multiple, related test cases in one test
and uses subtests for verification. The test cases do not affect each
other, so that the test guarantees are the same as before.

The `airgap-images` and `auto-deploy-charts` tests are merged into the
`auto-deploy`test.

The `containerd-config` and `kubelet-config` tests are merged into the
`configuration` test.

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