Ensure the screen itself is flag-guarded, not just the entry point
in Developer Options.
Fixes: 311724167
Test: m -j
flash, ensure feature is off, search for quarantined in Settings
search, ensure no results
Change-Id: I4efaf1f7c6452d2ce6115f40fffa16963ee7c244
Customize the dialog to include a button to allow
users to take an app out of the quarantine state.
Bug: 297934650
Test: atest tests/robotests/src/com/android/settings/development/quarantine/QuarantinedAppsScreenControllerTest.java
Change-Id: I1b6e9f057fed91ae131602fd6d6ddf5e23958a65