Adding "assignmentState" property to scope model in access review APIs (#14039)

Author: kaiwenfeng4086

specification/authorization/resource-manager/Microsoft.Authorization/preview/2021-03-01-preview/authorization-AccessReviewCalls.json

@@ -1405,6 +1405,19 @@
             "modelAsString": true
           }
         },
+        "assignmentState": {
+          "type": "string",
+          "readOnly": true,
+          "description": "The role assignment state eligible/active to review",
+          "enum": [
+            "eligible",
+            "active"
+          ],
+          "x-ms-enum": {
+            "name": "AccessReviewScopeAssignmentState",
+            "modelAsString": true
+          }
+        },
         "inactiveDuration": {
           "type": "string",
           "format": "duration",