Temporarily ignore `CharacterTest#test_getType_I` test failures.

This test seems to be failing when run on the ART Buildbot (LUCI)
since its recent update (in aosp/1904011), presumably because it
is run against old ICU prebuilts that need to be updated.
Temporarily ignore these failures until the issue is properly
addressed.

Test: Run Libcore test with `art/tools/run-libcore-tests.sh`
Bug: 209995834
Change-Id: I72919bc5649db8bc7fc530044ae4297f2ea2f78c
1 file changed