Remove kube-rbac-proxy

[yuanchen8911]

What this PR does / why we need it:

Following the upstream cluster-api instruction, remove unneeded component kube-rbac-proxy.

Which issue this PR fixes

Remove uneeded kube-rbac-proxy.

• cluster-api PR: ⚠️ Remove kube-rbac-proxy and expose metrics on localhost:8080 cluster-api#4640
• cluster-api book: https://cluster-api.sigs.k8s.io/developer/providers/v0.3-to-v0.4.html#required-kustomize-changes-to-remove-kube-rbac-proxy

Special notes for your reviewer:

Tested the changes locally to bring up capi controller managers and capk controller managers.

[yuanchen:~/projects/aci/go/cluster-api-provider-kubevirt/e2e]$ kubectl get pods -A
NAMESPACE                           NAME                                                            READY   STATUS    RESTARTS      AGE
capi-kubeadm-bootstrap-system       capi-kubeadm-bootstrap-controller-manager-64fcd4ff4d-p6jgh      1/1     Running   0             6m41s
capi-kubeadm-control-plane-system   capi-kubeadm-control-plane-controller-manager-6f86697dc-jmn8f   1/1     Running   0             6m40s
capi-system                         capi-controller-manager-7847d5c678-8gqbh                        1/1     Running   0             6m41s
capk-system                         capk-controller-manager-67c486ffd6-wm4h4                        2/2     Running   2 (72s ago)   5m37s
cert-manager                        cert-manager-6dc4964c9-gp2kg                                    1/1     Running   0             7m3s
cert-manager                        cert-manager-cainjector-69d4647c6-fdzmx                         1/1     Running   0             7m3s
cert-manager                        cert-manager-webhook-75f77865c8-4b7dq                           1/1     Running   0             7m3s
kube-system                         coredns-565d847f94-kvbc6                                        1/1     Running   0             28m
kube-system                         coredns-565d847f94-zghlh                                        1/1     Running   0             28m
kube-system                         etcd-kubevirt-control-plane                                     1/1     Running   0             29m
kube-system                         kindnet-vjtk5                                                   1/1     Running   0             29m
kube-system                         kube-apiserver-kubevirt-control-plane                           1/1     Running   0             29m
kube-system                         kube-controller-manager-kubevirt-control-plane                  1/1     Running   0             29m
kube-system                         kube-proxy-vxtxb                                                1/1     Running   0             29m
kube-system                         kube-scheduler-kubevirt-control-plane                           1/1     Running   0             29m
local-path-storage                  local-path-provisioner-684f458cdd-sgrm6                         1/1     Running   0             2

Release notes:

Remove kube-rbac-proxy 

[yuanchen8911]

/cc @cchengleo

[coveralls]

Pull Request Test Coverage Report for Build 4057721529

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 52.655%

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Totals
Change from base Build 3882884209:	0.0%
Covered Lines:	952
Relevant Lines:	1808

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💛 - Coveralls

[yuanchen8911]

/cc @agradouski

[cchengleo]

/ok-to-test

[cchengleo]

/LGTM

[agradouski]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: agradouski, yuanchen8911

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