[ExpressiveDesign] Add menuButtonContentDescription to MenuHandler

MenuHandler is implemented by both menu and order menu. Thus they
can override the content description property.

Bug: 441617900
Test: talkback & visual
Flag: EXEMPT BUGFIX
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:d8e20902c47cc7b87e2e439dd39c0d39a3a95f39
Merged-In: I9980b8253fc78a81aa6ec7c5bbd425928ed52305
Change-Id: I9980b8253fc78a81aa6ec7c5bbd425928ed52305