test(fix): setting the default tier to default on AKS test (cloudna…

…tive-pg#4709)

Starting on version 2.47.0 of `az aks` command a new option was added `--tier`
which is used to specify the tier for the cluster being created, more information
here: https://learn.microsoft.com/en-us/azure/aks/free-standard-pricing-tiers

Closes cloudnative-pg#4708

Signed-off-by: Jonathan Gonzalez V <jonathan.gonzalez@enterprisedb.com>
Signed-off-by: Douglass Kirkley <dkirkley@eitccorp.com>

.github/workflows/continuous-delivery.yml

@@ -957,6 +957,7 @@ jobs:
             # create and login to the AKS cluster
             az aks create --resource-group ${{ secrets.AZURE_RESOURCEGROUP }} \
               --name ${AZURE_AKS} \
+              --tier standard \
               --node-count 3 -k v${K8S_VERSION} --generate-ssh-keys --enable-addons monitoring \
               --workspace-resource-id ${{ secrets.AZURE_WORKSPACE_RESOURCE_ID }} \
               --aks-custom-headers EnableAzureDiskFileCSIDriver=true