gh-76785: Avoid Pickled TracebackException for Propagated Subinterpreter Exceptions...

gh-76785: Avoid Pickled TracebackException for Propagated Subinterpreter Exceptions (gh-113036)

We need the TracebackException of uncaught exceptions for a single purpose: the error display.  Thus we only need to pass the formatted error display between interpreters.  Passing a pickled TracebackException is overkill.