refactor: migrate LaunchAccessibilityActivityPreferenceFragment to

xml/PreferenceControllers style

- Only rely on componentName passed into fragment's argument, this
  allows the fragment to be self contained
- Modify the xml so it's easier to glance what's included in this
  fragment
- Add preference controllers for each preference item
- Update the fragment test to be closer to integration test that could
  be used to verify the user interactions

Bug: 406052931
Test: atest com.android.settings.accessibility
Test: manually verify the user interactions and UI on the screens
Flag: EXEMPT risk taken
Change-Id: I558aebef3c7ab376242ac3dfa6f768dc83364dbc