Move feature-level Bubble setting into developer options; default to off

Functionality:
* Moves feature-level setting into developer settings (apps section)
* Adds bubbles in developer options under "apps" section
* Configures the app-specific bubble toggle in notifications settings
  to be hidden / shown based on the developer setting
* Configures the channel-specific bubble toggle in notification channel
  settings to be hidden / shown based on the developer setting

Tests:
* Anything that might be assuming that it's globally enabled now has
  a bit to enable it globally in that test
* There is a logic change now where the app-level setting would be available
  even if off globally, now that is not true -- if it's off globally the
  app-level is no longer available
* Adds tests for the developer setting

Test: make -j40 RunSettingsRoboTests ROBOTEST_FILTER="Bubble"
Bug: 131845765
Change-Id: I5f6bf74e5ada3fc023571825cca10d7bddc60e6e

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -104,7 +104,6 @@ import com.android.settings.nfc.AndroidBeam;
 import com.android.settings.nfc.PaymentSettings;
 import com.android.settings.notification.AppBubbleNotificationSettings;
 import com.android.settings.notification.AppNotificationSettings;
-import com.android.settings.notification.BubbleNotificationSettings;
 import com.android.settings.notification.ChannelGroupNotificationSettings;
 import com.android.settings.notification.ChannelNotificationSettings;
 import com.android.settings.notification.ConfigureNotificationSettings;
@@ -216,7 +215,6 @@ public class SettingsGateway {
             DreamSettings.class.getName(),
             UserSettings.class.getName(),
             NotificationAccessSettings.class.getName(),
-            BubbleNotificationSettings.class.getName(),
             AppBubbleNotificationSettings.class.getName(),
             ZenAccessSettings.class.getName(),
             ZenAccessDetails.class.getName(),