Update all non-bundle sectioners to check isClassified

Move isClassified check to BundleUtil
Move makeClassifiedConversation to kosmos for test

Bug: 402358371
Test: ColorizedFgsCoordinatorTest
Test: ConversationCoordinatorTest
Test: HeadsUpCoordinatorTest
Test: LockScreenMinimalismCoordinatorTest
Test: RankingCoordinatorTest
Flag: android.service.notification.notification_classification
Change-Id: I87161130e063f5f2c01c7c0cfba8563528ad17b0