Add logic to update E3682 to require Engine (#3421)

Author: kddejong

src/cfnlint/data/schemas/extensions/aws_rds_dbinstance/aurora_exclusive.json

@@ -9,6 +9,9 @@
     "type": "string"
    }
   },
+  "required": [
+   "Engine"
+  ],
   "type": "object"
  },
  "then": {

test/unit/rules/resources/rds/test_db_instance_aurora_exclusive.py

@@ -34,6 +34,10 @@ def rule():
             },
             [],
         ),
+        (
+            {"MasterUserPassword": "Test"},
+            [],
+        ),
         (
             {
                 "Engine": "aurora",