Enhanced monitoring can be configured on aurora clusters (#3801)

Author: kddejong

src/cfnlint/data/schemas/extensions/aws_rds_dbcluster/aurora.json

@@ -18,8 +18,6 @@
    "AllocatedStorage": false,
    "DBClusterInstanceClass": false,
    "Iops": false,
-   "MonitoringInterval": false,
-   "MonitoringRoleArn": false,
    "PubliclyAccessible": false,
    "StorageType": {
     "if": {