Review uses of ACR Access

[kon-angelo]

Kubernetes deprecated provider specific code from core components. See e.g. kubernetes/kubernetes@910630f#diff-d99dcedb62ecf6a10053f7c82d47dff1faf12dbeceb872d86aa87f7d2dd4ea65

Provider-azure still uses ACRAccess field

gardener-extension-provider-azure/pkg/apis/azure/types_infrastructure.go

Line 240 in 8abd8d7

ACRAccess *bool

and

gardener-extension-provider-azure/pkg/webhook/controlplane/ensurer.go

Line 396 in 8abd8d7

command = extensionswebhook.EnsureStringWithPrefix(command, "--azure-container-registry-config=", acrConfigPath)

which should have been already deprecated for newer versions