Correclty promote flags to experimental for 0.85 release (#56374)

Summary:
This is a reland of commit `401b162` on main.

## Changelog:

[Internal] -

Pull Request resolved: #56374

Test Plan: N/A

Reviewed By: zeyap

Differential Revision: D100024009

Pulled By: cortinico

fbshipit-source-id: 56a27794afba803291c037f5d6a1ece5f1813849

Author: cortinico

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsOverrides_RNOSS_Experimental_Android.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<<dffc5db0f80501f6246f9d6087c6fb4a>>
+ * @generated SignedSource<<187ac62197545fbce9d537527b4aed3b>>
  */
 
 /**
@@ -23,9 +23,13 @@ public open class ReactNativeFeatureFlagsOverrides_RNOSS_Experimental_Android :
   // We could use JNI to get the defaults from C++,
   // but that is more expensive than just duplicating the defaults here.
 
+  override fun cxxNativeAnimatedEnabled(): Boolean = true
+
   override fun enableAccessibilityOrder(): Boolean = true
 
   override fun enableSwiftUIBasedFilters(): Boolean = true
 
   override fun preventShadowTreeCommitExhaustion(): Boolean = true
+
+  override fun useSharedAnimatedBackend(): Boolean = true
 }

packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsOverridesOSSExperimental.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<<c5b1dc86ec11d40e5d26ae8a6f0ee6ff>>
+ * @generated SignedSource<<c40323a221bd3dfd6d498d495a2a2297>>
  */
 
 /**
@@ -27,6 +27,10 @@ class ReactNativeFeatureFlagsOverridesOSSExperimental : public ReactNativeFeatur
  public:
     ReactNativeFeatureFlagsOverridesOSSExperimental() = default;
 
+  bool cxxNativeAnimatedEnabled() override {
+    return true;
+  }
+
   bool enableAccessibilityOrder() override {
     return true;
   }
@@ -38,6 +42,10 @@ class ReactNativeFeatureFlagsOverridesOSSExperimental : public ReactNativeFeatur
   bool preventShadowTreeCommitExhaustion() override {
     return true;
   }
+
+  bool useSharedAnimatedBackend() override {
+    return true;
+  }
 };
 
 } // namespace facebook::react

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

@@ -80,7 +80,7 @@ const definitions: FeatureFlagDefinitions = {
         expectedReleaseValue: true,
         purpose: 'experimentation',
       },
-      ossReleaseStage: 'none',
+      ossReleaseStage: 'experimental',
     },
     defaultTextToOverflowHidden: {
       defaultValue: true,
@@ -931,7 +931,7 @@ const definitions: FeatureFlagDefinitions = {
         expectedReleaseValue: true,
         purpose: 'experimentation',
       },
-      ossReleaseStage: 'none',
+      ossReleaseStage: 'experimental',
     },
     useTraitHiddenOnAndroid: {
       defaultValue: false,