Long press back to open DevMenu (#53189)

Summary:
Pull Request resolved: #53189

In addition to the menu button and long pressing fast forward option, adds long pressing back as an option to open DevTools for devices like the Chromecast remote.

Changelog:
[Android][Added] - Add long-press back as an option to open the DevMenu for devices that lack menu & fast-forward.

{F1981060943}

Reviewed By: alanleedev

Differential Revision: D79923779

fbshipit-source-id: b758d591ebe3b8e601dbf704212123451e3c32e1

Author: sbuggay

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactDelegate.kt

@@ -247,7 +247,7 @@ public open class ReactDelegate {
   }
 
   public fun onKeyLongPress(keyCode: Int): Boolean {
-    if (keyCode == KeyEvent.KEYCODE_MEDIA_FAST_FORWARD) {
+    if (keyCode == KeyEvent.KEYCODE_MEDIA_FAST_FORWARD || keyCode == KeyEvent.KEYCODE_BACK) {
       if (ReactNativeNewArchitectureFeatureFlags.enableBridgelessArchitecture() &&
           reactHost != null) {
         val devSupportManager = reactHost?.devSupportManager