Add UI for multiple admins on Headless

In a series of CLs under topic add_ui_for_hsum_admins UI and functionality for allowing multiple admins on HSUM build is added. In User settings and User switcher when creating a new user there is a new dialog prompting to choose admin status of the user to be created. In User details view there is a toggle that is visible to admin users that allows to modify admin status of existing users. This toggle is only applicable to full users that are not supervised, guests or a main device user.

Bug: 252790451
Test: croot && make RunSettingsRoboTests -j40 ROBOTEST_FILTER="com.android.settings.users.UserDetailsSettingsTest"
Change-Id: I447dc168be30aa614aeb3f8b71ad14a7223fd7c1

src/com/android/settings/users/UserDialogs.java

@@ -202,4 +202,19 @@ public final class UserDialogs {
                 .setNegativeButton(android.R.string.cancel, null)
                 .create();
     }
+
+    /**
+     * Creates a dialog to confirm that the admin privileges of the user should be revoked.
+     *
+     * @param onConfirmListener Callback object for positive action
+     */
+    public static Dialog createConfirmRevokeAdmin(Context context,
+            DialogInterface.OnClickListener onConfirmListener) {
+        return new AlertDialog.Builder(context)
+                .setTitle(R.string.user_revoke_admin_confirm_title)
+                .setMessage(R.string.user_revoke_admin_confirm_message)
+                .setPositiveButton(R.string.remove, onConfirmListener)
+                .setNegativeButton(android.R.string.cancel, null)
+                .create();
+    }
 }