stream: don't deadlock duplexpair
If nothing is buffered then _read will not be called and the callback will not invoked, effectivly deadlocking.
Fixes: https://github.com/nodejs/node/issues/29758 Refs: https://github.com/nodejs/node/pull/29649
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines