fix(ext/node): handle undefined http2 ping payload and cancel pending pings on destroy (#33561)
## Summary
Enables `test-http2-ping-settings-heapdump` in node_compat suite.
## Test plan
- [x] `cargo test --test node_compat --
test-http2-ping-settings-heapdump`
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Co-authored-by: divybot <divybot@users.noreply.github.com>
Co-authored-by: Divy Srivastava <me@littledivy.com>