Activity interceptor dialog for suspended apps

Added an AlertActivity to intercept the start for an activity belonging
to a suspended app. More details will be shown if the suspending app
also defines an activity to handle the API action
SHOW_SUSPENDED_APP_DETAILS.

Test: Added tests to existing classes. Can be run via:
atest com.android.server.pm.SuspendPackagesTest
atest com.android.server.pm.PackageManagerSettingsTests
atest com.android.server.pm.PackageUserStateTest

Bug: 75332201
Change-Id: I85dc4e9efd15eedba306ed5b856f651e3abd3e99