Add Payg to licenseType (#20838)

Co-authored-by: yuronhe <[email protected]>

Author: YurongHe

specification/azurearcdata/resource-manager/Microsoft.AzureArcData/preview/2022-03-01-preview/sqlServerInstances.json

@@ -119,6 +119,7 @@
           "type": "string",
           "description": "SQL Server license type.",
           "enum": [
+            "Payg",
             "Paid",
             "Free",
             "HADR",