Add config flag in Settings to control whether restricted profiles are offered.

This adds a config resource to specify whether restricted profiles
should be offered as an option when a new user is added. This replaces
the previous check if a device is voice capable, and will be defaulted
to false.

Bug: 202854971
Test: make RunSettingsRoboTests -j40 ROBOTEST_FILTER="com.android.settings.users.UserCapabilitiesTest"
Change-Id: If090fe8d902d6521acfde8c26e801aa4fc4f5ff4

tests/robotests/src/com/android/settings/testutils/shadow/ShadowUserManager.java

@@ -49,6 +49,7 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
     private final Map<String, List<EnforcingUser>> mRestrictionSources = new HashMap<>();
     private final List<UserInfo> mUserProfileInfos = new ArrayList<>();
     private final Set<Integer> mManagedProfiles = new HashSet<>();
+    private final Set<String> mEnabledTypes = new HashSet<>();
     private boolean mIsQuietModeEnabled = false;
     private int[] profileIdsForUser = new int[0];
     private boolean mUserSwitchEnabled;
@@ -105,6 +106,11 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
         mGuestRestrictions.add(restriction);
     }
 
+    @Implementation
+    protected boolean hasUserRestriction(String restrictionKey) {
+        return hasUserRestriction(restrictionKey, UserHandle.of(UserHandle.myUserId()));
+    }
+
     public static ShadowUserManager getShadow() {
         return (ShadowUserManager) Shadow.extract(
                 RuntimeEnvironment.application.getSystemService(UserManager.class));
@@ -199,4 +205,17 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
     public void setSwitchabilityStatus(@UserManager.UserSwitchabilityResult int newStatus) {
         mSwitchabilityStatus = newStatus;
     }
+
+    @Implementation
+    protected boolean isUserTypeEnabled(String userType) {
+        return mEnabledTypes.contains(userType);
+    }
+
+    public void setUserTypeEnabled(String type, boolean enabled) {
+        if (enabled) {
+            mEnabledTypes.add(type);
+        } else {
+            mEnabledTypes.remove(type);
+        }
+    }
 }