Make activity section header in Community Notifications Settings not …

…focusable

Summary:
As part of the Android Accessibility Wave, we want to remove **keyboard focus** for the "Activity" header of the Community Notification Settings

This is because keyboard focus should only focus on relevant screen content. Since the "Activity" heading is considered a "non-interactive" element, we want to remove it from keyboard focus.

This diff:
- Replaces `focusable` with `screenReaderFocusable` for **MigSectionHeader**
- Adds `focusable` to **MigSectionHeaderCTASpec**. That way, the header only gets focusability when it's interactive
- Add new test cases to test that the header is screen reader focusable and is only focusable if it's interactive

Differential Revision: D64793278

fbshipit-source-id: cf6fb3243f8e48ecd3905390ac23aa03e690f6ab

litho-core/src/main/java/com/facebook/litho/DebugLayoutNode.kt

@@ -57,6 +57,9 @@ class DebugLayoutNode internal constructor(private val result: LithoLayoutResult
   val focusable: Boolean
     get() = node.nodeInfo?.focusState == NodeInfo.FOCUS_SET_TRUE
 
+  val screenReaderFocusable: Boolean
+    get() = node.nodeInfo?.screenReaderFocusState == NodeInfo.SCREEN_READER_FOCUS_SET_TRUE
+
   val contentDescription: CharSequence?
     get() = node.nodeInfo?.contentDescription
 

litho-testing/src/main/java/com/facebook/litho/testing/subcomponents/InspectableComponent.java

@@ -252,7 +252,15 @@ public Integer getImportantForAccessibility() {
    */
   public boolean getFocusable() {
     final DebugLayoutNode layout = mComponent.getLayoutNode();
-    return layout == null ? false : layout.getFocusable();
+    return layout != null && layout.getFocusable();
+  }
+
+  /**
+   * @return The boolean value of the screenReaderFocusable property on this debug component.
+   */
+  public boolean getScreenReaderFocusable() {
+    final DebugLayoutNode layout = mComponent.getLayoutNode();
+    return layout != null && layout.getScreenReaderFocusable();
   }
 
   /**