Improve the visibility of allapps item on talkback focus

result: https://photos.app.goo.gl/TqTDboxa2WFfZUoz8

Flag: com.android.launcher3.accessibility_scroll_on_allapps
Bug: 265392261
Test: Manual

Change-Id: If1cce3d0bd501361837dafb24cbe2fde7bac0ac0
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index 0da2df1..3769124 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -388,3 +388,13 @@
     description: "Refactor grid migration such that the code is simpler to understand and update"
     bug: "358399271"
 }
+
+flag {
+    name: "accessibility_scroll_on_allapps"
+    namespace: "launcher"
+    description: "Scroll to item position if accessibility focused"
+    bug: "265392261"
+    metadata {
+      purpose: PURPOSE_BUGFIX
+    }
+}