Ignore some Chooser tests that flake on races.

As described in b/222124533, the reliability of these tests
can be improved with a timeout, but that's still not a very
solid fix. We should just ignore them for now so they stop
breaking on the monitor, and meanwhile I'll continue
investigating the root cause.

Bug: 222124533, 220337209, 220959679, 218218953
Test: disabling tests only
Change-Id: I113a1ba4de2176e209339a1cbbe2583cb5fe518c