Fix text in notification settings for apps that do not send notifications

Added a new string to show for apps apps that target T, but do not declare the POST_NOTIFICATIONS permission in notification settings.

Bug: 229108007
Test: `croot` `make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.notification.app.NotificationsOffPreferenceControllerTest"` and manual: open Settings-Notifications-App Settings, check the text for apps that does not post notifications with toggle disabled. Text should be: "This app does not send notifications" when system language is English.
Change-Id: I9822b6f983e00c5982522099e339d86fae45aefe

src/com/android/settings/notification/NotificationBackend.java

@@ -126,6 +126,7 @@ public class NotificationBackend {
             if (app.requestedPermissions == null || Arrays.stream(app.requestedPermissions)
                     .noneMatch(p -> p.equals(android.Manifest.permission.POST_NOTIFICATIONS))) {
                 row.lockedImportance = true;
+                row.permissionStateLocked = true;
             }
         }
     }
@@ -684,6 +685,9 @@ public class NotificationBackend {
         public boolean systemApp;
         public boolean lockedImportance;
         public boolean showBadge;
+        // For apps target T but have not but has not requested the permission
+        // we cannot change the permission state
+        public boolean permissionStateLocked;
         public int bubblePreference = NotificationManager.BUBBLE_PREFERENCE_NONE;
         public int userId;
         public int blockedChannelCount;