Flip useTurboModules default value to true (#56898)

Summary:
Pull Request resolved: #56898

TurboModules have been the only supported NativeModule execution mode for all in-prod apps for a while; every internal override hardcodes `useTurboModules()` to `true`. Flip the underlying default in `ReactNativeFeatureFlags.config.js` from `false` to `true` so that any consumer that does not explicitly override the flag also gets the modern behavior.

Generated files updated by `js1 featureflags --update`:
- `ReactNativeFeatureFlagsDefaults.kt` (Kotlin default)
- `ReactNativeFeatureFlagsDefaults.h` (C++ default)
- `ReactNativeFeatureFlags.js` (JS default)

No interface or accessor signatures changed.

Changelog:
[General][Changed] - The default value of the `useTurboModules` ReactNativeFeatureFlags flag is now `true`

Differential Revision: D105718212

Author: mdvacca

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<a2ee2a39f68b48278eaa301fee26af03>>
+ * @generated SignedSource<<fe71238401f38ad227665a6f0dd6087b>>
  */
 
 /**
@@ -193,7 +193,7 @@ public open class ReactNativeFeatureFlagsDefaults : ReactNativeFeatureFlagsProvi
 
   override fun useTurboModuleInterop(): Boolean = false
 
-  override fun useTurboModules(): Boolean = false
+  override fun useTurboModules(): Boolean = true
 
   override fun useUnorderedMapInDifferentiator(): Boolean = false
 

packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<92f6cddfad7651ea742f956f40377d76>>
+ * @generated SignedSource<<66079ebd2cb7c003b0fe5ce135b28645>>
  */
 
 /**
@@ -368,7 +368,7 @@ class ReactNativeFeatureFlagsDefaults : public ReactNativeFeatureFlagsProvider {
   }
 
   bool useTurboModules() override {
-    return false;
+    return true;
   }
 
   bool useUnorderedMapInDifferentiator() override {

packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.config.js

@@ -957,7 +957,7 @@ const definitions: FeatureFlagDefinitions = {
       ossReleaseStage: 'canary',
     },
     useTurboModules: {
-      defaultValue: false,
+      defaultValue: true,
       metadata: {
         description:
           'When enabled, NativeModules will be executed by using the TurboModule system',

packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<d76f42e46c039d6c07d021cbf906de35>>
+ * @generated SignedSource<<002a219eed0f854feb2ada440cbee27e>>
  * @flow strict
  * @noformat
  */
@@ -541,7 +541,7 @@ export const useTurboModuleInterop: Getter<boolean> = createNativeFlagGetter('us
 /**
  * When enabled, NativeModules will be executed by using the TurboModule system
  */
-export const useTurboModules: Getter<boolean> = createNativeFlagGetter('useTurboModules', false);
+export const useTurboModules: Getter<boolean> = createNativeFlagGetter('useTurboModules', true);
 /**
  * Use std::unordered_map instead of TinyMap in the Differentiator for improved lookup performance.
  */