Ensure that if the stacktrace fallback is required it always has formatting support #359
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This in particular was exposred by gcc-14 when it was build without the
--enable-libstdcxx-backtrace=yes
flag. In this case it does not ship with the__cpp_lib_stacktrace
enabled, but the__cpp_lib_fomatters
flag indicated stack trace formatting is supported...Here we need to say if we are using boost stacktrace when we need to define a formatter for it.