Add e2e example manifests for Network peering

config/samples/e2e/bases/network-peering/machine1.yaml

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+apiVersion: compute.ironcore.dev/v1alpha1
+kind: Machine
+metadata:
+  name: machine-sample1
+spec:
+  machineClassRef:
+    name: machineclass-sample
+  ignitionRef:
+    name: ignition
+    key: ignition.yaml
+  networkInterfaces:
+  - name: primary
+    ephemeral:
+      networkInterfaceTemplate:
+        spec:
+          ipFamilies:
+          - IPv4
+          ips:
+          - value: 10.0.0.1
+          networkRef:
+            name: network-sample1
+          virtualIP:
+            ephemeral:
+              virtualIPTemplate:
+                spec:
+                  type: Public
+                  ipFamily: IPv4
+  volumes:
+  - name: root-disk-1
+    ephemeral:
+      volumeTemplate:
+        spec:
+          volumeClassRef:
+            name: volumeclass-sample
+          image: gardenlinux:rootfs-image
+          resources:
+            storage: 10Gi
+

config/samples/e2e/bases/network-peering/machine2.yaml

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+apiVersion: compute.ironcore.dev/v1alpha1
+kind: Machine
+metadata:
+  name: machine-sample2
+spec:
+  machineClassRef:
+    name: machineclass-sample
+  ignitionRef:
+    name: ignition
+    key: ignition.yaml
+  networkInterfaces:
+  - name: primary
+    ephemeral:
+      networkInterfaceTemplate:
+        spec:
+          ipFamilies:
+          - IPv4
+          ips:
+          - value: 10.0.0.2
+          networkRef:
+            name: network-sample2
+          virtualIP:
+            ephemeral:
+              virtualIPTemplate:
+                spec:
+                  type: Public
+                  ipFamily: IPv4
+  volumes:
+  - name: root-disk-1
+    ephemeral:
+      volumeTemplate:
+        spec:
+          volumeClassRef:
+            name: volumeclass-sample
+          image: gardenlinux:rootfs-image
+          resources:
+            storage: 10Gi
+

config/samples/e2e/bases/network-peering/network1.yaml

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+apiVersion: networking.ironcore.dev/v1alpha1
+kind: Network
+metadata:
+  name: network-sample1
+spec:
+  peerings:
+  - name: peering1
+    networkRef:
+      name: network-sample2

config/samples/e2e/bases/network-peering/network2.yaml

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+apiVersion: networking.ironcore.dev/v1alpha1
+kind: Network
+metadata:
+  name: network-sample2
+  namespace: dev-team-onmetal-api
+spec:
+  peerings:
+  - name: peering2
+    networkRef:
+      name: network-sample1

config/samples/e2e/network-peering/README.md

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+# Network Peering Sample deployement
+
+This example deploys two `Network`s peered with each other and these `Network`s are referenced in `Machine`s.
+The following artifacts will be deployed in your namespace:   
+- IronCore `Network`, `NetworkInterface` and `VirtualIP`
+- IronCore `Machine` 
+- IronCore `Volume`
+- Secret containing the `ignition`
+
+## Prerequisites
+
+- [Butane](https://coreos.github.io/butane/)
+
+## Usage
+1. Adapt the `namespace` in `kustomization.yaml`
+2. Replace `your-user`, `your-pw-hash` and `your-ssh-key`s in the `ignition/ignition.yaml`
+3. Run `ignition/regenerate-ignition.sh`
+4. Create the below `patch-machine.yaml` in `network-peering` folder with the desired `machineClassRef`, `machinePoolRef`, `volumeClassRef`, `volumePoolRef`, `image` etc. as per your environment
+
+```
+apiVersion: compute.ironcore.dev/v1alpha1
+kind: Machine
+metadata:
+  name: machine-sample
+spec:
+  machineClassRef:
+    name: new-machineClass
+  machinePoolRef:
+    name: new-machinePool
+  volumes:
+  - name: root-disk-1
+    ephemeral:
+      volumeTemplate:
+        spec:
+          volumeClassRef:
+            name: new-volumeClass
+          volumePoolRef:
+            name: new-volumePool
+          image: gardenlinux:rootfs-dev-20231025
+          resources:
+            storage: 15Gi
+```
+
+5. Update the `kustomization.yaml` with below content
+```
+patches:
+- path: patch-machine.yaml
+```
+
+6. Run (`kubectl apply -k ./`) 

config/samples/e2e/network-peering/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: test
+
+resources:
+- ../bases/ignition
+- ../bases/network-peering