scaletest: Align kops scalability configuration with kube-up for CCM concurrentNodeSyncs

[ronaldngounou]

Align kops scalability configuration with kube-up by setting cloudControllerManager.concurrentNodeSyncs=5 to match the kubernetes default values.

Contributes to #18070

[ronaldngounou]

/test pull-kops-gce-master-scale-performance-100
/test pull-kops-ec2-master-scale-performance-100

[k8s-ci-robot]

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[k8s-ci-robot]

@ronaldngounou: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-k8s-gce-cilium	0c6cc15	link	true	/test pull-kops-e2e-k8s-gce-cilium

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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