Updating strings for activity interceptor dialog

Updated to more descriptive title and button text.
The default message dialog will also show the suspending app name.

Test: atest \
com.android.server.pm.SuspendPackagesTest#testInterceptorActivity

Bug: 75332201
Change-Id: Ica77fb04874a8e32fe0d82ac27a9babd3b186f8d