Convert LockscreenSmartspaceController.isWeatherEnabled to a flow

Bug: 317891876
Test: atest KeyguardSmartspaceRepositoryImplTest, KeyguardSmartspaceViewModelTest
Flag: ACONFIG com.android.systemui.migrate_clocks_to_blueprint STAGING

Change-Id: I29b4799482bc6f87171fd958458552c971cc060d
11 files changed