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[Tests] `(e)poll*` syscalls and underlying `DkStreamsWaitEvents` PAL API function lack proper testing
Description of the problem
(e)poll* syscalls and underlying DkStreamsWaitEvents PAL API function heavily lack in tests coverage. Currently we only have a couple of tests in Libos/regression and some LTP tests enabled. This leads to some bugs creeping around e.g. one in #2313, which could be easily caught with proper testing.