test: skip flaky parts of broadcastchannel test on Windows
The feature was added recently and is experimental. This will need to be fixed before it can be released as stable (in my opinion at least). But for now, this gets us to a green CI without skipping the parts of the test that are working on Windows.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
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