Autoclick: Test stability improvements

- Re-enable AutoclickPanelTests after completion of
  http://ag/34734535
- Use AndroidJUnit4
- Ensure all the rules have specific
- Start each test with the panel initiated and closed

Bug: 428796322, 434087472
Test: AutoclickClickTypeTests, AutoclickPanelTests
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: I908e03f2966a28b03eb872b67ff094d0796bcb4a