WIP fix runBackground with -i/--no-server
#4259
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This might have been the cause of a lot of flakiness that seems to have gone away with #4254, as the server exiting caused the
runBackgroundcalls to exit causing the http servers to exit and fail to pick up requests.Might have been caused by com-lihaoyi/os-lib#324 which made
destroyOnExitthe default for spawned subprocesses. This PR explicitly disablesdestroyOnExitfor the subprocesses wherebackground = trueCovered by a new
integration.invalidationtest that runs under bothserverandfork, that previously failed when run underfork