[helm] fix PDB templating and add support for HPA, pod affinity etc

[enneitex]

Fixes https://github.com/kubernetes/dashboard/issues/8340 Fixes https://github.com/kubernetes/dashboard/issues/8137

• Updated podDisruptionBudget template file and splitted it in two files, so we can create a PDB per deployment instead of one for the whole app.
• Removed app.scheduling.nodeSelector as it was breaking tempalting when it was defined but not api.nodeSelector
• Added variables to set affinity, tolerations, replicas, topologySpreadConstraints and HorizontalPodAutoscaler for WEB and API deployments
• moved replicas from app.scaling to each component so we can set different replica for WEB and API deployments

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PR needs rebase.

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@k8s-triage-robot: Closed this PR.

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