Fixing MainThreadInitializedObject

> Making SafeCloseable implementation mandatory, to prevent leaks during test and preview
> Removing getNoCreate method and defining executeIfCreated to avoid null pointer exceptions
> Fixing sandbox value leaking into main, by Checking sandbox against App context
> Converting sanbox to an interface instead a class

Bug: 335280439
Test: Presubmit
Flag: None
Change-Id: I951dcde871898e745ff6490a1c4f8fd1512888f5

src/com/android/launcher3/testing/TestInformationHandler.java

@@ -94,13 +94,10 @@ public class TestInformationHandler implements ResourceBasedOverride {
 
     protected Context mContext;
     protected DeviceProfile mDeviceProfile;
-    protected LauncherAppState mLauncherAppState;
 
     public void init(Context context) {
         mContext = context;
-        mDeviceProfile = InvariantDeviceProfile.INSTANCE.
-                get(context).getDeviceProfile(context);
-        mLauncherAppState = LauncherAppState.getInstanceNoCreate();
+        mDeviceProfile = InvariantDeviceProfile.INSTANCE.get(context).getDeviceProfile(context);
         if (sActivityLifecycleCallbacks == null) {
             sActivityLifecycleCallbacks = new ActivityLifecycleCallbacksAdapter() {
                 @Override