Fix json output when a node with attributes has the same key several times

[yardlogs]

Some XML nodes have the same key multiple times. If the sub node have attributes, only the last key is keeped.
I adapted the code that managed nodes without attributes to manage those with.

The event "Microsoft-Windows-CertificateServicesClient-Lifecycle-System/Operational 1007" with the "EKU" node show the case.

Before the fix

{
  [...]
    "UserData": {
      "CertNotificationData": {
        "#attributes": {
          "ProcessName": "PowerShell.exe",
          "AccountName": "LAB___\\Administrator",
          "Context": "Machine"
        },
        "CertificateDetails": {
          "#attributes": {
            "Thumbprint": "a35fb0138078445b81b907997a719c2d55f070a8"
          },
          "SubjectNames": {
            "SubjectName": "www.test.local",
            "SubjectName_1": "CN=test.local",
            "SubjectName_2": "test.local"
          },
          "EKUs": {
            "EKU": {
              "#attributes": {
                "Name": "Server Authentication",
                "OID": "1.3.6.1.5.5.7.3.1"
              }
            }
          },
          "NotValidAfter": "2025-09-23T13:23:57Z"
        }
      }
    }
  }
}

After the fix:

 {
   [...]
    "UserData": {
      "CertNotificationData": {
        "#attributes": {
          "ProcessName": "PowerShell.exe",
          "AccountName": "LAB___\\Administrator",
          "Context": "Machine"
        },
        "CertificateDetails": {
          "#attributes": {
            "Thumbprint": "a35fb0138078445b81b907997a719c2d55f070a8"
          },
          "SubjectNames": {
            "SubjectName": "www.test.local",
            "SubjectName_1": "CN=test.local",
            "SubjectName_2": "test.local"
          },
          "EKUs": {
            "EKU": {
              "#attributes": {
                "Name": "Server Authentication",
                "OID": "1.3.6.1.5.5.7.3.1"
              }
            },
            "EKU_1": {
              "#attributes": {
                "Name": "Client Authentication",
                "OID": "1.3.6.1.5.5.7.3.2"
              }
            }
          },
          "NotValidAfter": "2025-09-23T13:23:57Z"
        }
      }
    }
  }