Use structuredClone after replacing vm2

[danielpeintner]

Thank you, @danielpeintner, for providing this fix! After also doing some more research, I discovered that the problem might be related to vm2, since the error does not occur if you perform a structuredClone of an ExposedThingInit before passing it to the produce method (which I found pretty odd). Apparently, vm2 wraps unprocessed JavaScript objects somehow, so that they are not compatible with structuredClone anymore. With the old parse-stringify approach, this problem does not seem to be present.

I guess we could revisit using the more recommended structuredClone once again when a replacement for vm2 has been added to the code. For now, maybe we need to make sure that the problem does not appear in other CLI-related contexts as well.

Originally posted by @JKRhb in #1152 (comment)

relates to #1105 and #1035