prettier backtraces

We do some custom backtrace stuff in our panic hook (the relevant details being in panic.rs) and I don't really like the current output. It's very noisy, especially with printing the address of a frame even if we symbolicated it. That said I need to test it out in "production" environments where symbols are worse (no local debuginfo sitting in target/) to figure out what can be trimmed or not.

The situation isn't 1:1 (not using the backtrace crate) but minidump_processor has much prettier output with this more complex impl: https://github.com/rust-minidump/rust-minidump/blob/main/minidump-processor/src/process_state.rs#L737

Start by reading panic.rs and compare its backtrace formatting with the referenced minidump_processor implementation. Exercise the panic hook in environments with and without local debuginfo to determine which frame details remain useful. Done means a less noisy backtrace presentation while retaining useful information when symbols are unavailable.

Written by the indexing model from the issue text.