[Bug] When using unixpipe transport, killing an application stops remote applications.

[OlivierHecart]

Describe the bug

When using unixpipe transport, killing an application stops remote applications.

To reproduce

1. Build examples with unixpipe feature.
   mkdir build
cd build
cmake .. -DZENOHC_CARGO_FLAGS="--features=zenoh/transport_unixpipe"
cmake --build . --target examples
2. Start z_sub with unixpipe listening endpoint.
   ./target/release/examples/z_sub "demo/example/**" "[\"unixpipe/test.pipe\"]"
3. Start z_pub with unixpipe connect endpoint.
   ./target/release/examples/z_pub "demo/example/zenoh-c-pub" "Pub from C" 0 "[\"unixpipe/test.pipe\"]"
4. Kill z_pub
5. z_sub exits.

System info

• Platform: MacOS
• CPU: M2
• zenoh-c version: commit bd0fe98772b7d65e8fb71eb0369d7c85c9b09c73

[yellowhatter]

I think we need to investigate the pipe spec on it's behavior when other pipe end closes. That might be the reason of this bug.