Update title, message, positive button strings in uninstall confirmation

dialog when archiving an app

Additionally do not ask if the user wants to keep the app's data in case
it is an archiving operation because it is being kept anyway.

Strings doc: http://shortn/_LVkW3MVUCZ

Test: n/a

Bug: 290777135
Change-Id: I45e32e9e013a1033caea7f8e84493158e05cb779