[Cronet] Skip presumbit

This test has been deflaked upstream via crrev/c/4507293 and will
be added back to presubmit once this makes it downstream.

Bug: b/293141085
Bug: b/292298108
Test: na
Change-Id: I72fce3efb8cca2841990fca0e514fceeea0c01f9
1 file changed