Duplicate Thermostat Device in Home
I recently replaced my Nest Thermostat (Wi-Fi died on my original unit). Now I appear to be seeing both the original thermostat and the new one in HomeKit & Homebridge.

I removed the original from my google account before setting up the new unit. The original unit was offline for a while before I noticed that it stopped working. I did a device call and it looks like only one thermostat returns, so I'm unsure how this is getting pulled in by the plugin.

**Device call response:**
```
{
  "devices": [
    {
      "name": "enterprises/c153c774-718d-48f1-bb88-0c2d8b239290/devices/AVPHwEuxP08YJtAxEbEeUOvZZ6dPhR6Hmo7jUtexj9UlFvdb9YDnimFyQ-k2k_ycBe2XQYEmfWPX8JjaiJlNbOe11y90_g",
      "type": "sdm.devices.types.THERMOSTAT",
      "assignee": "enterprises/c153c774-718d-48f1-bb88-0c2d8b239290/structures/AVPHwEsCHvjW12atm4dGob4jWNRK5i0Cqt4mNINGQRBMWn_8MhG5kg9fi5lUYSUHMUGQw27VugJZiTx0IGkvT-_DAxtiaw/rooms/AVPHwEuauUSOs6xF2JISaHXK84ReqE9RNhgPQUHvb3RzRkFstar317Pw58m9wPbTWSl6WQoO1rybaEy7nT5HMLX0RlFwt4LI88yNOtEgnP4Qk6oEuH4Lr1Y48Og6eaewwNUbRhstHlxOsSg",
      "traits": {
        "sdm.devices.traits.Info": {
          "customName": ""
        },
        "sdm.devices.traits.Humidity": {
          "ambientHumidityPercent": 53
        },
        "sdm.devices.traits.Connectivity": {
          "status": "ONLINE"
        },
        "sdm.devices.traits.Fan": {},
        "sdm.devices.traits.ThermostatMode": {
          "mode": "HEAT",
          "availableModes": [
            "HEAT",
            "OFF"
          ]
        },
        "sdm.devices.traits.ThermostatEco": {
          "availableModes": [
            "OFF",
            "MANUAL_ECO"
          ],
          "mode": "OFF",
          "heatCelsius": 10,
          "coolCelsius": 24.444443
        },
        "sdm.devices.traits.ThermostatHvac": {
          "status": "OFF"
        },
        "sdm.devices.traits.Settings": {
          "temperatureScale": "FAHRENHEIT"
        },
        "sdm.devices.traits.ThermostatTemperatureSetpoint": {
          "heatCelsius": 20.603165
        },
        "sdm.devices.traits.Temperature": {
          "ambientTemperatureCelsius": 21.439987
        }
      },
      "parentRelations": [
        {
          "parent": "enterprises/c153c774-718d-48f1-bb88-0c2d8b239290/structures/AVPHwEsCHvjW12atm4dGob4jWNRK5i0Cqt4mNINGQRBMWn_8MhG5kg9fi5lUYSUHMUGQw27VugJZiTx0IGkvT-_DAxtiaw/rooms/AVPHwEuauUSOs6xF2JISaHXK84ReqE9RNhgPQUHvb3RzRkFstar317Pw58m9wPbTWSl6WQoO1rybaEy7nT5HMLX0RlFwt4LI88yNOtEgnP4Qk6oEuH4Lr1Y48Og6eaewwNUbRhstHlxOsSg",
          "displayName": "Living Room"
        }
      ]
    }
  ]
}
```

**From my Homebridge logs:**
```[10/6/2023, 12:16:36 PM] [homebridge-google-nest-sdm] Loading accessory from cache: Living Room Thermostat

[10/6/2023, 12:16:37 PM] [homebridge-google-nest-sdm] Adding new accessory: Living Room Thermostat
[Living Room Thermostat@@Eco] Characteristic not in required or optional characteristic section for service Thermostat. Adding anyway.
```

