Fix FieldsBelowInit and KotlinGenericsCast: Move properties above init block (#55357)

Summary:
Pull Request resolved: #55357

Fixed FieldsBelowInit lint errors in BridgelessReactContext.kt.

Moved property declarations (devSupportManager, defaultHardwareBackBtnHandler) above the init block to ensure proper initialization order.

Also added Suppress for KotlinGenericsCast warning on the generic cast that is necessary for the proxy implementation.

changelog: [internal] internal

Reviewed By: cortinico

Differential Revision: D91731938

fbshipit-source-id: 194fa6ae5d484d353b553bc0b42cf5a37c15877c

Author: mdvacca

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

@@ -49,6 +49,12 @@ internal class BridgelessReactContext(context: Context, private val reactHost: R
   private val sourceURLRef = AtomicReference<String>()
   private val TAG: String = this.javaClass.simpleName
 
+  val devSupportManager: DevSupportManager
+    get() = reactHost.devSupportManager
+
+  val defaultHardwareBackBtnHandler: DefaultHardwareBackBtnHandler
+    get() = reactHost.defaultBackButtonHandler
+
   init {
     if (ReactNativeNewArchitectureFeatureFlags.useFabricInterop()) {
       initializeInteropModules()
@@ -103,9 +109,6 @@ internal class BridgelessReactContext(context: Context, private val reactHost: R
 
   override fun destroy() = Unit
 
-  val devSupportManager: DevSupportManager
-    get() = reactHost.devSupportManager
-
   override fun registerSegment(segmentId: Int, path: String, callback: Callback) {
     reactHost.registerSegment(segmentId, path, callback)
   }
@@ -145,7 +148,7 @@ internal class BridgelessReactContext(context: Context, private val reactHost: R
             arrayOf<Class<*>>(jsInterface),
             BridgelessJSModuleInvocationHandler(reactHost, jsInterface),
         ) as JavaScriptModule
-    @Suppress("UNCHECKED_CAST")
+    @Suppress("UNCHECKED_CAST", "KotlinGenericsCast")
     return interfaceProxy as? T
   }
 
@@ -178,7 +181,4 @@ internal class BridgelessReactContext(context: Context, private val reactHost: R
   }
 
   override fun getJSCallInvokerHolder(): CallInvokerHolder? = reactHost.jsCallInvokerHolder
-
-  val defaultHardwareBackBtnHandler: DefaultHardwareBackBtnHandler
-    get() = reactHost.defaultBackButtonHandler
 }