[Fabric] Fix UIA_LiveSettingPropertyId to use VT_I4 datatype instead of VT_BSTR (#15438)

* [Fabric] Fix UIA_LiveSettingPropertyId to use VT_I4 datatype instead of VT_BSTR

Fixes #15050

Use GetLiveSetting() conversion function to properly convert accessibilityLiveRegion string values to long (VT_I4) datatype as required by UIA_LiveSettingPropertyId.

* call function with namespace

---------

Co-authored-by: vineethkuttan <[email protected]>

Author: ritoban23

change/react-native-windows-5bfa5aa2-4028-4dd5-bb13-031b42470bd2.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[Fabric] Fix UIA_LiveSettingPropertyId to use VT_I4 datatype instead of VT_BSTR",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

vnext/Microsoft.ReactNative/Fabric/Composition/CompositionViewComponentView.cpp

@@ -799,8 +799,8 @@ void ComponentView::updateAccessibilityProps(
   winrt::Microsoft::ReactNative::implementation::UpdateUiaProperty(
       EnsureUiaProvider(),
       UIA_LiveSettingPropertyId,
-      oldViewProps.accessibilityLiveRegion,
-      newViewProps.accessibilityLiveRegion);
+      winrt::Microsoft::ReactNative::implementation::GetLiveSetting(oldViewProps.accessibilityLiveRegion),
+      winrt::Microsoft::ReactNative::implementation::GetLiveSetting(newViewProps.accessibilityLiveRegion));
 
   winrt::Microsoft::ReactNative::implementation::UpdateUiaProperty(
       EnsureUiaProvider(), UIA_LevelPropertyId, oldViewProps.accessibilityLevel, newViewProps.accessibilityLevel);