feat: disable network policies generation by default (#1629)

* feat: disable network policies default generation

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

* docs: add the generate-network-policies flag to user guide

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

* test: add unit tests of the network policies generation

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

---------

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

script/test/fixtures/compose-file-support/output-k8s.yaml

@@ -2,9 +2,6 @@
 apiVersion: v1
 kind: Service
 metadata:
-  annotations:
-    kompose.cmd: ./kompose convert --stdout
-    kompose.version: 1.28.0 (4d1ce961)
   creationTimestamp: null
   labels:
     io.kompose.service: web
@@ -23,9 +20,6 @@ status:
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  annotations:
-    kompose.cmd: ./kompose convert --stdout
-    kompose.version: 1.28.0 (4d1ce961)
   creationTimestamp: null
   labels:
     io.kompose.service: web
@@ -38,12 +32,9 @@ spec:
   strategy: {}
   template:
     metadata:
-      annotations:
-        kompose.cmd: ./kompose convert --stdout
-        kompose.version: 1.28.0 (4d1ce961)
       creationTimestamp: null
       labels:
-        io.kompose.network/kompose-default: "true"
+        io.kompose.network/compose-file-support-default: "true"
         io.kompose.service: web
     spec:
       containers:
@@ -57,19 +48,3 @@ spec:
       restartPolicy: Always
 status: {}
 
----
-apiVersion: networking.k8s.io/v1
-kind: NetworkPolicy
-metadata:
-  creationTimestamp: null
-  name: kompose-default
-spec:
-  ingress:
-    - from:
-        - podSelector:
-            matchLabels:
-              io.kompose.network/kompose-default: "true"
-  podSelector:
-    matchLabels:
-      io.kompose.network/kompose-default: "true"
-