Revert Break into the debugger on panic (129019)
This was talked about a bit at a recent libs meeting. While I think experimenting with this is worthwhile, I am nervous about this new behaviour reaching stable. We've already reverted on one tier 1 platform (Linux, https://github.com/rust-lang/rust/pull/130810) which means we have differing semantics on different tier 1 platforms. Also the fact it triggers even when `catch_unwind` is used to catch the panic means it can be very noisy in some projects.
At the very least I think it could use some more discussion before being instantly stable. I think this could maybe be re-landed with an environment variable to control/override the behaviour. But that part would likely need a libs-api decision.
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