Re-enable privacy sandbox consent dialog flaky test to debug.

see https://chromium.googlesource.com/chromium/src/+/HEAD/docs/testing/gtest_flake_tips.md, potential causes:
 - For browsertest flakes that involve dialogs or widgets, make sure that test objects are not destroyed because focus is lost on the dialog
 - notice not being shown at all: https://g-issues.chromium.org/issues/325427167


Change-Id: I99eaf99bc77732fc70fb549b02fa3ba9f0d83cff
Bug: 371041180
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5906518
Reviewed-by: Abe Boujane <boujane@google.com>
Commit-Queue: Christine Ying <chrstne@google.com>
Cr-Commit-Position: refs/heads/main@{#1363622}