Add e2e test for custom path patterns

test/pod_test.go

test/testdata/custom-path-pattern/kustomization.yaml

test/testdata/custom-path-pattern/local-path-config.yaml

test/testdata/custom-path-pattern/pod.yaml

test/testdata/custom-path-pattern/pvc.yaml

test/testdata/custom-path-pattern/storage-class.yaml