fix(ext/node): check resource exists before close

[satyarohith]

The patch fixes grpc deadline example:

➜deno run -A deadline/client.js
Warning: Not implemented: Http2Session.socket
[1] wanted = OK got = OK
Warning: Not implemented: Http2Session.socket
[2] wanted = DEADLINE_EXCEEDED got = DEADLINE_EXCEEDED
Warning: Not implemented: Http2Session.socket
error: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'bodyRid')
    at node:http2:888:96
    at eventLoopTick (ext:core/01_core.js:207:9)

Fixed:

➜  examples git:(es_examples) denod run -A deadline/client.js
Warning: Not implemented: Http2Session.socket
[1] wanted = OK got = OK
Warning: Not implemented: Http2Session.socket
[2] wanted = DEADLINE_EXCEEDED got = DEADLINE_EXCEEDED
Warning: Not implemented: Http2Session.socket
[3] wanted = OK got = OK
Warning: Not implemented: Http2Session.socket
[4] wanted = DEADLINE_EXCEEDED got = DEADLINE_EXCEEDED
Warning: Not implemented: Http2Session.socket
[5] wanted = OK got = OK
Warning: Not implemented: Http2Session.socket
[6] wanted = DEADLINE_EXCEEDED got = DEADLINE_EXCEEDED

I added a smoke test in the internal repo.