Replace get/setPendingIntentBackgroundActivityLaunchAllowedByPermission

Replace usages of the old get/setPendingIntentBackgroundActivityLaunchAllowedByPermission
API with the new replacement (passing in mode = ALWAYS).

Test: atest DragAndDropPolicyTest StageCoordinatorTests AlarmManagerServiceTest BackgroundActivityStartControllerExemptionTests BackgroundActivityStartControllerTests ActivityOptionsTest ActivityStarterTests BackgroundActivityLaunchTest
Flag: EXEMPT refactor
Bug: 352182359
Change-Id: I183b868f9d7e1730b7831717e1d97f8d869231bb