remove subscriptions when removing bodies and vehicles

[alex-shortt]

as mentioned in #407, subscriptions don't seem to be removed when bodies/vehicles are removed

[vercel[bot]]

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Name	Status	Preview	Updated
use-cannon	✅ Ready (Inspect)	Visit Preview	Sep 21, 2022 at 2:00PM (UTC)

[bjornstar]

Thanks for the contribution! I'll cut a release this week and get it published.