AppClone: Changes to display app list on Cloned Apps page.

- Filers app list
- Displays preference summary
- Display two-target view
- Display header text
- Metric for cloned app page
- Adds bridge class
- Disable "Show system" option

Bug: 259021576
Bug: 249916469
Test: make RunSettingsRoboTests -j64
Change-Id: Idcf213325ead9e298eb3e958b286adcd4c06c8d5