Bugfix: Remove widgets and deep shortcuts of app which gets archived.

* Once app is archived, remove widgets and deep shortcuts corresponding to the app from the home screen.
* However during backup & restore, widgets should not be removed if they are being restored.

Test: verified bugfix locally.
Bug: 326567866
Flag: ACONFIG com.android.launcher3.enable_support_for_archiving DEVELOPMENT
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:bef2930f5a29655f6c403f2d5eefd4e99a733b04)
Merged-In: Ib3a112aadc7bd901fd6a0ba86f472ec6acf8d626
Change-Id: Ib3a112aadc7bd901fd6a0ba86f472ec6acf8d626