Add mTLS based tests to the VirtualNode integration test suite

[achevuru]

Issue #, if available:
NA
Description of changes:

• Add mTLS based tests to the VirtualNode integration test suite.
• PR also addresses an intermittent issue with VirtualNode - CloudMap Test.

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[fawadkhaliq]

The cloud map virtual node test is still failing

Virtual Node scenarios
  /home/ssm-user/actions-runner/_work/aws-app-mesh-controller-for-k8s/aws-app-mesh-controller-for-k8s/test/integration/virtualnode/virtualnode_test.go:62
    should create a virtual node with CloudMap ServiceDiscovery enabled [It]
    /home/ssm-user/actions-runner/_work/aws-app-mesh-controller-for-k8s/aws-app-mesh-controller-for-k8s/test/integration/virtualnode/virtualnode_test.go:163

    Unexpected error:
        <*errors.errorString | 0xc000c043e0>: {
            s: "instance count mismatch",
        }
        instance count mismatch
    occurred

[achevuru]

The cloud map virtual node test is still failing

Virtual Node scenarios
  /home/ssm-user/actions-runner/_work/aws-app-mesh-controller-for-k8s/aws-app-mesh-controller-for-k8s/test/integration/virtualnode/virtualnode_test.go:62
    should create a virtual node with CloudMap ServiceDiscovery enabled [It]
    /home/ssm-user/actions-runner/_work/aws-app-mesh-controller-for-k8s/aws-app-mesh-controller-for-k8s/test/integration/virtualnode/virtualnode_test.go:163

    Unexpected error:
        <*errors.errorString | 0xc000c043e0>: {
            s: "instance count mismatch",
        }
        instance count mismatch
    occurred

It is due to Envoy pointing to Prod while the appmesh resources are created in Preview. Issue will resolve itself once we point the controller away from preview.

[fawadkhaliq]

The cloud map virtual node test is still failing

Virtual Node scenarios
  /home/ssm-user/actions-runner/_work/aws-app-mesh-controller-for-k8s/aws-app-mesh-controller-for-k8s/test/integration/virtualnode/virtualnode_test.go:62
    should create a virtual node with CloudMap ServiceDiscovery enabled [It]
    /home/ssm-user/actions-runner/_work/aws-app-mesh-controller-for-k8s/aws-app-mesh-controller-for-k8s/test/integration/virtualnode/virtualnode_test.go:163

    Unexpected error:
        <*errors.errorString | 0xc000c043e0>: {
            s: "instance count mismatch",
        }
        instance count mismatch
    occurred

It is due to Envoy pointing to Prod while the appmesh resources are created in Preview. Issue will resolve itself once we point the controller away from preview.

Preview set here: #432 so we should be good once that is merged