Stopped FAB from triggering onTargetFeaturesChanged off of changes unrelated to button targets

Test: atest com.android.systemui.accessibility.floatingmenu
Flag: aconfig floating_menu_narrow_content_observer ENABLED
Bug: 331740049
Change-Id: I4e37e28a8ff715e44af0969b9cbd78fc088174db
diff --git a/packages/SystemUI/aconfig/accessibility.aconfig b/packages/SystemUI/aconfig/accessibility.aconfig
index 8137e40..14ebc39 100644
--- a/packages/SystemUI/aconfig/accessibility.aconfig
+++ b/packages/SystemUI/aconfig/accessibility.aconfig
@@ -32,6 +32,16 @@
 }
 
 flag {
+    name: "floating_menu_narrow_target_content_observer"
+    namespace: "accessibility"
+    description: "stops the FAB from monitoring enabled services to trigger target content changes."
+    bug: "331740049"
+    metadata {
+      purpose: PURPOSE_BUGFIX
+    }
+}
+
+flag {
     name: "floating_menu_overlaps_nav_bars_flag"
     namespace: "accessibility"
     description: "Adjusts bounds to allow the floating menu to render on top of navigation bars."