[SHv2] Clean up review notification permissions module in site settings

This is part of the larger Safety Hub feature check clean up now that
Safety Hub is fully launched on desktop. The review notification
permissions module is now replaced by a Safety Hub specific module,
this changes cleans up the dead code and obsolete metrics and strings.

OBSOLETE_HISTOGRAM[Settings.SafetyCheck.NotificationsListCount]=No
longer logged
OBSOLETE_HISTOGRAM[Settings.SafetyCheck.NotificationsModuleInteractions]
=No longer logged

Bug: 40267370, 40880681, 40277421
Change-Id: I0add0677c07581fefb4f5fe6f028f1dfa455af01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6054143
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Side YILMAZ <sideyilmaz@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Zaina Al-Mashni <zalmashni@google.com>
Cr-Commit-Position: refs/heads/main@{#1391017}