Intermittent Hangs in CI

[insertinterestingnamehere]

After some kind of runtime environment update to the github actions CI runners (as of Wednesday 9/25) we're now seeing very occasional hangs during the CI tests. This affects all Linux build configurations and happens either during the basics/arbitrary_blocking_operation test or the features/qlfqueue test.

[insertinterestingnamehere]

This will probably be a pain to debug so I don't think it's feasible to get it fixed before the upcoming release, however I have confirmed that these new failures are not caused by the new code in the release. It's an existing issue that only surfaces in the newer build environment.

[insertinterestingnamehere]

This seems to have gone away on its own. My best bet is that #297 fixed it, but I'm still not entirely sure.

[insertinterestingnamehere]

Just saw this again the day after closing it, but it's not showing up today. Perhaps the timeouts just need to be increased. Running on a busier CI instance could probably cause this. Leaving it closed for now, but I'm still keeping an eye out for it.

[insertinterestingnamehere]

Alright, we're still seeing these even after increasing the timeout thresholds. See https://github.com/sandialabs/qthreads/actions/runs/11448461793/job/31852093932?pr=305 for an example.

[insertinterestingnamehere]

I wonder if this is related to #267 (comment) as well. Plausible, but currently unclear.