Delete ReactRawTextShadowNode from codebase

Summary:
ReactRawTextShadowNode is part of legacy architecture and unused, let's delete it

changelog: [internal] internal

Reviewed By: javache

Differential Revision: D83188351

Author: mdvacca

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/ReactBaseTextShadowNode.kt

@@ -523,9 +523,7 @@ public constructor(
         val child: ReactShadowNode<*> = textShadowNode.getChildAt(i)
 
         @Suppress("DEPRECATION")
-        if (child is ReactRawTextShadowNode) {
-          child.text?.let { sb.append(apply(it, textAttributes.textTransform)) }
-        } else if (child is ReactBaseTextShadowNode) {
+        if (child is ReactBaseTextShadowNode) {
           buildSpannedFromShadowNode(
               child,
               sb,