Migrate robolectric tests to junit tests

This change do the 2 things:

1. Add new junit tests files which replace robolectric
   RobolectricTestRunner & RuntimeEnvironment with
   AndroidX objects without problem.
2. Remove the robolectric test files which have it's new junit files.

This change migrate 103 files, there are still 1209
files to go.

Bug: 174728471
Test: atest
      make RunSettingsRoboTests
Change-Id: I15ed3f4745b85862f720aabbf710ce1475aced93

tests/robotests/src/com/android/settings/panel/FakeSettingsPanelActivity.java

@@ -30,4 +30,4 @@ public class FakeSettingsPanelActivity extends SettingsPanelActivity {
         final Intent intent = new Intent(FakePanelContent.FAKE_ACTION);
         return intent;
     }
-}
+}