[vpc] Install Multus by default (#1587)

## What this PR does

The recent patch introducing VPCs in Cozystack did not include enabling
Multus, which is a dependency for this feature. This patch enables
Multus by default in the paas-full bundle.

### Release-note

```release-note
[vpc] Enable Multus by default as a necessary dependency for VPCs.
```

packages/core/platform/bundles/paas-full.yaml

@@ -76,6 +76,13 @@ releases:
   namespace: cozy-kubeovn
   dependsOn: [cilium,kubeovn]
 
+- name: multus
+  releaseName: multus
+  chart: cozy-multus
+  namespace: cozy-multus
+  privileged: true
+  dependsOn: [cilium,kubeovn]
+
 - name: cozy-proxy
   releaseName: cozystack
   chart: cozy-cozy-proxy