Do not send stacktraces to clients

[geropl]

There are a couple of places where we currently send stack traces back to clients in error cases:

• unhandled HTTP errors
• websocket method errors

We should avoid that as it allows 3rd parties to not only learn about our system (they also can do so from our repo), but in theory also about certain runtime configurations that we want to keep with ourselves. As we have no advantage of having those stack traces sent to clients, we can just disable those.

[stale]

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