ChannelParticipation integration tests fail with "too many open files" on OSX 10.15

Jay Guo

Hi folks,

I'm getting this bizarre error while trying to run integration tests of `ChannelPartitipation`. I'm on OSX 10.15 and wonder if anyone has ever encountered the same issue. I don't think my open files are close to the limit of the system.

Here's an example of failure log of one test case:

- Jay

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