Panic when setting RUST_MIN_STACK incorrectly about rust HOT 5 OPEN

I am nominating #125302 for a stable backport. I recommend actually carrying out such a backport only if there are other reasons to do a stable release, at which point it may make sense for it to a catch a ride.

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#125302 looks like the PR I would nominate for backporting. Not sure if this rises to the level of doing a point release if this is the only problem, given that it requires a bad env var value.

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@jeffreyssmith2nd fwiw, if this was happening before, my understanding is that it was not erroring, but rather simply being ignored, so you can probably unset it.

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@jeffreyssmith2nd can you report back if #125302 fix the issue for you? Should be available in a nightly (maybe also already in beta) . Thanks

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error: `RUST_MIN_STACK` should be a number of bytes, but was "1e+07"
    |
    = note: you can also unset `RUST_MIN_STACK` to use the default stack size

Looks good to me, available on both nightly and beta 👍

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