async_hooks: avoid double-destroy HTTPParser

Avoid that destroy hook is invoked twice - once via `Parser::Free()`
and once again via `Parser::Reinitialize()` by clearing the async_id
in `EmitDestroy()`.

Partial backport of https://github.com/nodejs/node/pull/27477, a full
backport would require also https://github.com/nodejs/node/pull/25094
which has a dont-land-on-v10.x label on it.

Fixes: https://github.com/nodejs/node/issues/26961

Backport-PR-URL: https://github.com/nodejs/node/pull/27986
PR-URL: https://github.com/nodejs/node/pull/27477


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>