Add e2e example manifests for LoadBalancer (#1137)

* e2e example manifests for loadbalancer

* refactoring with ephemeral objects

config/samples/e2e/bases/loadbalancer-public/kustomization.yaml

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+resources:
+- network.yaml
+- machine1.yaml
+- machine2.yaml
+- loadbalancer.yaml

config/samples/e2e/bases/loadbalancer-public/loadbalancer.yaml

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+apiVersion: networking.ironcore.dev/v1alpha1
+kind: LoadBalancer
+metadata:
+  name: loadbalancer-sample
+spec:
+  type: Public
+  ipFamilies: [IPv4]
+  networkRef:
+    name: network-sample
+  networkInterfaceSelector:
+    matchLabels:
+      app: web
+  ports:
+  - port: 80

config/samples/e2e/bases/loadbalancer-public/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:
+        metadata:
+          labels:
+            app: web  
+        spec:
+          ipFamilies:
+          - IPv4
+          ips:
+          - value: 10.0.0.1
+          networkRef:
+            name: network-sample
+          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/loadbalancer-public/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:
+        metadata:
+          labels:
+            app: web  
+        spec:
+          ipFamilies:
+          - IPv4
+          ips:
+          - value: 10.0.0.2
+          networkRef:
+            name: network-sample
+          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/loadbalancer-public/network.yaml

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+apiVersion: networking.ironcore.dev/v1alpha1
+kind: Network
+metadata:
+  name: network-sample

config/samples/e2e/loadbalancer-public/README.md

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+# `LoadBalancer` of `type: Public`
+
+This example deploys a `LoadBalancer` of `type: Public` by selecting two target `NetworkInterface`s via a `networkInterfaceSelector` `metav1.LabelSelector`. These two `NetworkInterface`s are referencing to same `Network` and will be attached to two different `Machine`s.
+
+The following artifacts will be deployed in your namespace:   
+- IronCore `LoadBalancer`
+- IronCore `Network`, `NetworkInterface`s and `VirtualIP`s
+- IronCore `Machine`s 
+- IronCore `Volume`s
+- 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 `loadbalancer-public` 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/loadbalancer-public/kustomization.yaml

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