test: removed pkg/kubernetes/testdata (#1018)

The `testdata` was no longer being used. Hence, removed it.

Signed-off-by: VaibhavMalik4187 <vaibhavmalik2018@gmail.com>

pkg/kubernetes/testdata/kubeconfig

@@ -1,16 +0,0 @@
-apiVersion: v1
-clusters:
-- cluster:
-    server: https://192.168.49.2:8443
-  name: minikube
-contexts:
-- context:
-    cluster: minikube
-    namespace: default
-    user: minikube
-  name: minikube
-current-context: minikube
-kind: Config
-preferences: {}
-users:
-- name: minikube