[gardener] Disable UpdateWindowSizeExitsFullscreen

Disable UpdateWindowSizeExitsFullscreen. It's flaky.

Bug: 335640705
Change-Id: Ib592e050ea309544bea2725a2abecd0cf09589af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5462626


Owners-Override: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Andy Phan <andyphan@chromium.org>
Auto-Submit: Nina Satragno <nsatragno@chromium.org>
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1289488}