Fixing user tap on suspended widget

Widgets get masked with separate remove views when suspended. Need to
update them with the correct pending intent. Moved around the logic
creating the suspended alert activity to make it reusable.

Test: Manually, "pm suspend <app-with-widget>", followed by tap on
widget
Existing tests pass:
atest GtsSuspendAppsTestCases
atest com.android.server.am.ActivityStartInterceptorTest

Bug: 79474038
Change-Id: Ic75ee762434bf92c54bda307e9cb6018f94a914c