internal/dag: merge builder_test and status_test

[davecheney]

Currently we test the DAG builder's output via buider_test.go, we also test the status output via status_test.go. Both of these tests do the same thing -- take some k8s objects, feed them to a KubernetesCache, pass that cache to a builder, build a dag, compare the output.

Currently adding a test for status means doing that hop/skip/jump in status_test.go, but if you also changed the code in builder.go, then you should by right be adding a test in builder_test.go as well.

This is double handling and means neither test suite are complete. What we should do is merge the status output checking into builder_test.go so that for each builder test we assert the resultant dag, and the status outputs.