[ReleasePR timeseriesinsights] [Hub Generated] Review request for Microsoft.TimeSeriesInsights to add version preview/2021-03-31-preview (#1980)

Create to sync Azure/azure-rest-api-specs#16415
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/timeseriesinsights?expand=1)

Author: msftbot[bot]

schemas/2021-03-31-preview/Microsoft.TimeSeriesInsights.json

@@ -993,6 +993,20 @@
     "PrivateEndpointConnectionProperties": {
       "type": "object",
       "properties": {
+        "groupIds": {
+          "oneOf": [
+            {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "A list of private links resource group ids"
+        },
         "privateEndpoint": {
           "oneOf": [
             {
@@ -1030,7 +1044,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "The provisioning state of the private endpoint connection resource."
+          "description": "Provisioning state of the private endpoint connection."
         }
       },
       "required": [