Auto merge of #68969 - RalfJung:dont-panic, r=oli-obk

remove Panic variant from InterpError

The interpreter engine itself does not raise `Panic` errors any more, so remove them from the error enum. Instead, const-prop and const-eval have to do their own handling of panics.

I used the opportunity to refactor the const-eval error handling a bit to use the `MachineStop` variant.

Also, in const-prop I could do some cleanup as now, no more lints are being reported in `use_ecx`. However, I am quite puzzled by why exactly the linting there works the way it does -- the code can certainly be cleaned up more, but I don't know enough of the intent to do that. I left some questions for the most confusing parts, but for now behavior should be unchanged by this PR (so, all that weirdness I am asking about is pre-existing and merely maintained here). Cc @wesleywiser

Fixes https://github.com/rust-lang/rust/issues/66902

r? @oli-obk

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