fix: Remove Cilium chainingMode when kubeproxyreplacement is enabled (#1340)

**What problem does this PR solve?**:
AL2023 does not have portmap binary installed. This breaks chaining mode
of the cilium and cilium is not able to create pod networking.
The chaining mode is no longer required after cilium 1.8 and when
kubeproxy replacement is enabled.

References:
https://docs.cilium.io/en/latest/installation/cni-chaining-portmap/

https://docs.cilium.io/en/latest/network/kubernetes/kubeproxy-free/#kubeproxyfree-hostport

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
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Tested by creating EKS cluster. The clilium DS pods were failing with
```
failed to assert if endpoint BPF programs need to be reloaded: retrieving device lxc4bfccc8739f5: Link not found
```
Other errors in the kubelet
```
Warning  FailedCreatePodSandBox  2d4h                   kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "b5a9 │
│ 0c710b2844894e9822124cdb6c6ac2f4175d7b00dd0b7a9f3d787674f69c": plugin type="portmap" failed (add): failed to find plugin "portmap" in path [/opt/cni/bin]                             │
│   Warning  FailedCreatePodSandBox  2d4h                   kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "14c8 │
│ f11b00cd49e7725737b9febacbf6b0aa7150ec927d56b1c4a07168172260": plugin type="cilium-cni" failed (add): unable to allocate IP via local cilium agent: [POST /ipam][502] postIpamFailure │
│  "No more IPs available"

```
After removing `chainingMode: portmap` the cilium was able to create pod
networking.


**Special notes for your reviewer**:
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Author: supershal

charts/cluster-api-runtime-extensions-nutanix/addons/cni/cilium/values-template.yaml

@@ -1,5 +1,7 @@
 cni:
+{{- if not .EnableKubeProxyReplacement }}
   chainingMode: portmap
+{{- end }}
   exclusive: false
 hubble:
   enabled: true