Setup external/robolectric for SettingsRoboTests

Current failing tests: ab/I64100010182936387
Had to Ignore some of com.android.settings.accessibility tests, which will be fixed separately

Bug: 261728063
Test: atest SettingsRoboTests -- --test-arg com.android.tradefed.testtype.IsolatedHostTest:java-flags:-XX:CompressedClassSpaceSize=3g

Change-Id: I4a0cb992db924936826e0c9808accc78dddb5f30

tests/robotests/src/com/android/settings/bluetooth/BluetoothDevicePairingDetailBaseTest.java

@@ -54,7 +54,10 @@ import org.robolectric.shadow.api.Shadow;
 
 /** Tests for {@link BluetoothDevicePairingDetailBase}. */
 @RunWith(RobolectricTestRunner.class)
-@Config(shadows = {ShadowBluetoothAdapter.class})
+@Config(shadows = {
+        ShadowBluetoothAdapter.class,
+        com.android.settings.testutils.shadow.ShadowFragment.class,
+})
 public class BluetoothDevicePairingDetailBaseTest {
 
     @Rule