Fix two possible issues with the environment escape communication #1555
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The first issue is when subprocesses are created after the main process has activated the environment escape. In this case, multiple processes could try to communicate wit the single escaped server which is a big no no. We explicitly block this from happening now. The case we ran into was an object allocated in a parent being gc in a subprocess.
The second issue relates to the GC which could trigger while another communication was happening. This could result in a deadlock since the lock protecting the communication is not reentrant (on purpose). We solve this by preventing the GC from being active during that time.