Don't free Ractors in GC shutdown

rb_gc_shutdown_call_finalizer_p returns false for threads and fibers, so
it should probably do the same for all Ractors (not just the main one).

This hopefully mitigates a bug where, at exit, rb_ractor_terminate_all
gets all Ractors to stop before continuing with the shutdown process.
However when vm->ractor.cnt reaches 1, the native threads may still be
running code at the end co_start, which reads/locks on
th->ractor->threads.sched, so the Ractor is not safe to free.

A better solution might be to ensure that all native threads end up
stopped or otherwise parked before this part of the shutdown, however
that would be a bit more involved.

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