Enables the App Enumeration Feature

This change enables the app enumeration feature by default. This change
is very likely to break some tests that manually install APKs. The fix
for them is generally easy: add the --force-queryable flag to the shell
command.

This change will also make some apps targetting R unable to see other
apps that are installed or sideloaded on the device.
go/app-visibility-playbook outlines the steps needed to re-gain that
visibility.

Fixes: 136675067
Test: atest AppEnumerationTests AppsFilterTest
Test: atest CtsCalendarProviderTestCases
Test: atest CtsAccountManagerTestCases
Test: atest CtsContentTestCases
Test: atest CtsPermission2TestCases
Test: atest CtsAppSecurityTests
Test: atest CtsAppTestCases
Change-Id: I9db3c0768416dd7ba24108b2a142a24672dab561