Manually roll ICU to 7ca3ffa to pick up an upstream fix for quarter handling.

Remove the hack that prevent unexpected behavior in ICU
and remove the skip of failing tests.

Bug: v8:8151,v8:7869
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ic9a56679bf1eb9dc18c739161838d518fd664d6f
Reviewed-on: https://chromium-review.googlesource.com/1214522Reviewed-by: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55774}