test: fix more test_spawn_broken_pipe races #19587
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On old Python versions, we can get the process-exited callback from the child watcher at the time of registration, without a return to the mainloop. That means that for very fast-exiting processes, we might never get a chance to write to them to observe a EPIPE error. Add a synchronization point so that we can prevent the process from exiting until after we've finished spawning it (and registering the watch). Closes cockpit-project#19586
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On old Python versions, we can get the process-exited callback from the child watcher at the time of registration, without a return to the mainloop. That means that for very fast-exiting processes, we might never get a chance to write to them to observe a EPIPE error.
Add a synchronization point so that we can prevent the process from exiting until after we've finished spawning it (and registering the watch).
Closes #19586