A push stream should have its writable side closed upon receipt, to avoid emitting the 'aborted' event when the readable side is closed.

(As far as I can tell this has been an issue as long as http2 has been around.)

Fixes: #22851

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines