feat: Parametrize number of replicas for HA deployment

[mjozefcz]

For some deployments 3 replicas are a bit too much. Let's parametrize it.

[linux-foundation-easycla]

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• ✅ login: mjozefcz / name: Maciej Józefczyk (b4702ba)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mjozefcz
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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

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/lifecycle rotten

[rjbez17]

/remove-lifecycle rotten
/ok-to-test
/lgtm