Checks that prebundled categories contain only preinstalled contents.

Bug: 353888087
Test: atest AccessibilitySettingsTest
Test: manually check all prebundled services are still in their proper
      groups, even after installing an APK update
Flag: com.android.settings.accessibility.check_prebundled_is_preinstalled
Change-Id: I023db9c37d7990deb50c9eec516619f0a8db65b7