Set default osDiskSizeGB based on OS Type #1586

Job	Run time
Get Param File List	5s
Validation (byoKms.json)	1m 9s
Validation (byoKmsPrivateLink.json)	1m 15s
Validation (cilium-cni-overlay.json)	59s
Validation (classic-custom-vnet-plus-firewall.json)	1m 9s
Validation (cni-overlay.json)	1m 14s
Validation (dapr.json)	55s
Validation (defender.json)	51s
Validation (edgeK8sVersion.json)	54s
Validation (gitOps.json)	1m 22s
Validation (istioServiceMesh.json)	59s
Validation (justresourcename.json)	1m 0s
Validation (key-vault.json)	1m 9s
Validation (managed-private-privatelink.json)	1m 18s
Validation (managed-private.json)	58s
Validation (managed-public.json)	1m 42s
Validation (managedNatGw.json)	1m 11s
Validation (open-secure.json)	1m 15s
Validation (optimised-for-well-architected.json)	1m 4s
Validation (publicKms.json)	1m 14s
Validation (restrictedAzPolicy.json)	1m 6s
Validation (scale-userpool-from-zero.json)	52s
Validation (simple-simple.json)	1m 6s
Validation (the-cheapest-cluster.json)	1m 23s
Validation (windows2019.json)	1m 5s
	27m 15s

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