[iOS][Sheriff] Disable RestoreTestCase flakes

High failure rate on ios_chrome_web_eg2tests_module iPad Air 2 14.5.

Bug: 1379254
Change-Id: I285392ff66a4454a93a1dc60530da2e2fc26add1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3990763


Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Owners-Override: Greg Thompson <grt@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1064792}