Fix snapshot tests

[BriocheBerlin]

When running the snapshot tests, 3 of them fail, namely panic_verbose, successful_run_can_enforce_backtrace and panic_is_reported_as_such.

For one, setting up the canary takes a different amount of time.
Also name demangling seems to fail (see also #201 )

Apparently the last good commit is 73ba0cc, "Merge #253" . In between then and now there seem to be a changing number of failures.

[jonathanpallant]

#280 should fix the demangling?

[Lotterleben]

I've re-ran the tests on main– this issue seems to be fixed by now (by #280?), but one test still fails due to updated logging statements– will open a separate PR for that