WIP: See if we can consistently repro flaky IoUringTest.ioUringIsAvailableOnLinux()

[bryce-anderson]

See if we can make #2585 consistently pop.

[bryce-anderson]

Based on the failed tests, it seems that this problem is specific to IOUring.

[bryce-anderson]

It looks like one of the IOUring threads is indeed still alive:

	app//io.netty.incubator.channel.uring.Native.ioUringEnter(Native Method)
	app//io.netty.incubator.channel.uring.IOUringCompletionQueue.ioUringWaitCqe(IOUringCompletionQueue.java:99)
	app//io.netty.incubator.channel.uring.IOUringEventLoop.cleanup(IOUringEventLoop.java:338)
	app//io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:1044)
	app//io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	app//io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	[email protected]/java.lang.Thread.runWith(Thread.java:1596)
	[email protected]/java.lang.Thread.run(Thread.java:1583)

This is despite the executor believing it is shutdown: isShutdown(): true
https://github.com/apple/servicetalk/pull/2758/checks?check_run_id=18681028715

[bryce-anderson]

It turns out this is a netty bug that affects short lived loops. netty/netty-incubator-transport-io_uring#227

[bryce-anderson]

We have a repro on netty directly so this is no longer necessary.