Puts dispatchUserAdded inside Binder.withCleanCallingIdentity

dispatchUserAdded eventually calls handleIncomingUser. And it requires
callingUid to have INTERACT_ACROSS_USERS permission.
That was failing some tests for auto.
This CL makes sure that method is called with clean calling identity.

Bug: 232945806
Test: atest CtsMultiUserTestCases:android.multiuser.cts.UserManagerTest#testCreateUser_withNewUserRequest_shouldCreateUserWithCorrectProperties
Change-Id: I2d0984c5166dd650f81a3a72696cece8054da26a

services/core/java/com/android/server/pm/UserManagerService.java

@@ -4209,8 +4209,8 @@ public class UserManagerService extends IUserManager.Stub {
         updateUserIds();
         Binder.withCleanCallingIdentity(() -> {
             mPm.onNewUserCreated(preCreatedUser.id, /* convertedFromPreCreated= */ true);
+            dispatchUserAdded(preCreatedUser, token);
         });
-        dispatchUserAdded(preCreatedUser, token);
         return preCreatedUser;
     }