feat(1765): update tests, move unit test to proper file, improve removeEmptyInterfaces algo

Signed-off-by: Martin Jirku <martin@jirku.sk>

script/test/fixtures/network-policies/output-k8s.yaml

@@ -2,7 +2,6 @@
 apiVersion: v1
 kind: Service
 metadata:
-  creationTimestamp: null
   labels:
     io.kompose.service: nginx
   name: nginx
@@ -19,7 +18,6 @@ spec:
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  creationTimestamp: null
   labels:
     io.kompose.service: nginx
   name: nginx
@@ -28,10 +26,8 @@ spec:
   selector:
     matchLabels:
       io.kompose.service: nginx
-  strategy: {}
   template:
     metadata:
-      creationTimestamp: null
       labels:
         io.kompose.network/network-policies-web: "true"
         io.kompose.service: nginx
@@ -43,7 +39,6 @@ spec:
             - containerPort: 80
               hostPort: 80
               protocol: TCP
-          resources: {}
       restartPolicy: Always
 
 
@@ -51,7 +46,6 @@ spec:
 apiVersion: networking.k8s.io/v1
 kind: NetworkPolicy
 metadata:
-  creationTimestamp: null
   name: network-policies-web
 spec:
   ingress: