[ReleasePR mediaservices] [AMS] Make primaryVerificationKey nullable (#2548)

Create to sync Azure/azure-rest-api-specs#20489
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/mediaservices?expand=1)

Author: msftbot[bot]

schemas/2021-11-01/Microsoft.Media.json

@@ -47,19 +47,19 @@
           "items": {
             "oneOf": [
               {
-                "$ref": "#/definitions/mediaServices_accountFilters_childResource"
+                "$ref": "#/definitions/mediaservices_privateEndpointConnections_childResource"
               },
               {
-                "$ref": "#/definitions/mediaservices_privateEndpointConnections_childResource"
+                "$ref": "#/definitions/mediaServices_transforms_childResource"
               },
               {
-                "$ref": "#/definitions/mediaServices_assets_childResource"
+                "$ref": "#/definitions/mediaServices_accountFilters_childResource"
               },
               {
-                "$ref": "#/definitions/mediaServices_contentKeyPolicies_childResource"
+                "$ref": "#/definitions/mediaServices_assets_childResource"
               },
               {
-                "$ref": "#/definitions/mediaServices_transforms_childResource"
+                "$ref": "#/definitions/mediaServices_contentKeyPolicies_childResource"
               },
               {
                 "$ref": "#/definitions/mediaServices_streamingPolicies_childResource"