Description of problem:
radosgw-admin notification get/list output json is missing closing brace at the end 
and S3Metadata and S3Tags are inside of S3Key.
if configured with metadata filter

[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ radosgw-admin notification list --bucket bobbyd.20-bucky-2877-0
{
    "notifications": [
        {
            "TopicArn": "arn:aws:sns:default::cephci-kafka-broker-ack-type-4143182e6a864a04",
            "Id": "notification-Delete",
            "Events": [
                "s3:ObjectCreated:*",
                "s3:ObjectRemoved:*"
            ],
            "Filter": {
                "S3Key": {
                    "FilterRules": [
                        {
                            "Name": "prefix",
                            "Value": "prefix1"
                        }
                    ],
                    "S3Metadata": {},
                    "S3Tags": {}
                }
            }
        }
    ][cephuser@ceph-ck-squid-8i54kq-node5 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ radosgw-admin notification get --bucket bobbyd.20-bucky-2877-0 --notification-id notification-Delete
{
    "TopicArn": "arn:aws:sns:default::cephci-kafka-broker-ack-type-4143182e6a864a04",
    "Id": "notification-Delete",
    "Events": [
        "s3:ObjectCreated:*",
        "s3:ObjectRemoved:*"
    ],
    "Filter": {
        "S3Key": {
            "FilterRules": [
                {
                    "Name": "prefix",
                    "Value": "prefix1"
                }
            ],
            "S3Metadata": {},
            "S3Tags": {}
        }
    }[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ radosgw-admin notification get --bucket bobbyd.20-bucky-2877-0 --notification-id notification-Delete | jq .
parse error: Unfinished JSON term at EOF at line 19, column 5
[cephuser@ceph-ck-squid-8i54kq-node5 ~]$ 



pass log on 7.1:
http://magna002.ceph.redhat.com/cephci-jenkins/hsm/PR_rgw_admin_notif_commands/test_bucket_notification_kafka_broker_copy.console.log


fail log on 8.0:
http://magna002.ceph.redhat.com/cephci-jenkins/hsm/TFA_squid_notif_topic_get/test_bucket_notification_kafka_broker_persistent_delete.console.log_notif_list_output_json_missing_close_bracket


Version-Release number of selected component (if applicable):
ceph version 19.1.0-21.el9cp

How reproducible:
always

Steps to Reproduce:
1.create a topic
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ aws --endpoint-url http://10.0.211.132:80 sns create-topic --name topic1
{
    "TopicArn": "arn:aws:sns:default::topic1"
}
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ 

2.put bucket notifications on the bucket with metadata filter
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ aws --endpoint-url http://10.0.211.132:80 s3api put-bucket-notification-configuration --bucket bkt1 --notification-configuration file://notif.json 
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ cat notif.json 
{
    "TopicConfigurations": [
        {
            "Id": "notif1",
            "TopicArn": "arn:aws:sns:default::topic1",
            "Events": [
                "s3:ObjectCreated:*"
            ],
            "Filter": {
                "Key": {
                    "FilterRules": [
                        {"Name": "prefix", "Value": "prefix1"}
                     ]
                 }
             }
        }
    ]
}
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ aws --endpoint-url http://10.0.211.132:80 s3api get-bucket-notification-configuration --bucket bkt1
{
    "TopicConfigurations": [
        {
            "Id": "notif1",
            "TopicArn": "arn:aws:sns:default::topic1",
            "Events": [
                "s3:ObjectCreated:*"
            ],
            "Filter": {
                "Key": {
                    "FilterRules": [
                        {
                            "Name": "prefix",
                            "Value": "prefix1"
                        }
                    ]
                }
            }
        }
    ]
}
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$

3.try radosgw-admin notification get/list. the output is missing end brace and S3Metadata, S3Tags are inside of S3Key.
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ radosgw-admin notification list --bucket bkt1
{
    "notifications": [
        {
            "TopicArn": "arn:aws:sns:default::topic1",
            "Id": "notif1",
            "Events": [
                "s3:ObjectCreated:*"
            ],
            "Filter": {
                "S3Key": {
                    "FilterRules": [
                        {
                            "Name": "prefix",
                            "Value": "prefix1"
                        }
                    ],
                    "S3Metadata": {},
                    "S3Tags": {}
                }
            }
        }
    ][cephuser@ceph-ck-squid-8i54kq-node6 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ radosgw-admin notification get --bucket bkt1 --notification-id notif1
{
    "TopicArn": "arn:aws:sns:default::topic1",
    "Id": "notif1",
    "Events": [
        "s3:ObjectCreated:*"
    ],
    "Filter": {
        "S3Key": {
            "FilterRules": [
                {
                    "Name": "prefix",
                    "Value": "prefix1"
                }
            ],
            "S3Metadata": {},
            "S3Tags": {}
        }
    }[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ 
[cephuser@ceph-ck-squid-8i54kq-node6 ~]$ 


Actual results:
the output json format is missing closing brace at the end. also S3Metadata and S3Tags are inside of S3Key.

Expected results:
expected notification get/list returns correct json syntax output

Additional info: