http2: fix several serious bugs

Currently http2 does not properly submit GOAWAY frames when a session
is being destroyed. It also doesn't properly handle when the other
party severs the connection after sending a GOAWAY frame, even though
it should.

Edge, IE & Safari are currently unable to handle empty TRAILERS
frames despite them being correctly to spec. Instead send an empty
DATA frame with END_STREAM flag in those situations.

Fix and adjust several flaky and/or incorrect tests.

Backport-PR-URL: https://github.com/nodejs/node/pull/22850
PR-URL: https://github.com/nodejs/node/pull/20772
Fixes: https://github.com/nodejs/node/issues/20705
Fixes: https://github.com/nodejs/node/issues/20750
Fixes: https://github.com/nodejs/node/issues/20850


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>