CodeGen from PR 17060 in Azure/azure-rest-api-specs

Remove Preview PrometheusRuleGroups resource type (#17060)

This reverts commit 9dee51c3deb2b76628f6496665d53861cdb7efcf.

Author: SDKAuto

schemas/2021-07-22-preview/Microsoft.AlertsManagement.json

@@ -70,9 +70,6 @@
         {
           "$ref": "https://schema.management.azure.com/schemas/2021-04-01/Microsoft.AlertsManagement.json#/resourceDefinitions/smartDetectorAlertRules"
         },
-        {
-          "$ref": "https://schema.management.azure.com/schemas/2021-07-22-preview/Microsoft.AlertsManagement.json#/resourceDefinitions/prometheusRuleGroups"
-        },
         {
           "$ref": "https://schema.management.azure.com/schemas/2021-08-08-preview/Microsoft.AlertsManagement.json#/resourceDefinitions/actionRules"
         },