Remove unused animatedShouldDebounceQueueFlush feature flag (#57340)

Summary:
Pull Request resolved: #57340

`animatedShouldDebounceQueueFlush` is no longer read anywhere — `NativeAnimatedHelper` now debounces the queue flush unconditionally. Remove the now-dead flag definition and its generated getter.

Changelog:
[Internal]

Reviewed By: christophpurrer

Differential Revision: D109472811

fbshipit-source-id: 2afe41cda10aa53440ac5084cec5989654dfecb0

Author: zeyap

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

@@ -970,17 +970,6 @@ const definitions: FeatureFlagDefinitions = {
       },
       ossReleaseStage: 'none',
     },
-    animatedShouldDebounceQueueFlush: {
-      defaultValue: true,
-      metadata: {
-        dateAdded: '2024-02-05',
-        description:
-          'Enables an experimental flush-queue debouncing in Animated.js.',
-        expectedReleaseValue: true,
-        purpose: 'experimentation',
-      },
-      ossReleaseStage: 'none',
-    },
     animatedShouldSyncValueBeforeStartCallback: {
       defaultValue: true,
       metadata: {

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<<f44477b5f5a4f7030798a61694d0332a>>
+ * @generated SignedSource<<1a333a44919efce6bb2070bae79bdf9b>>
  * @flow strict
  * @noformat
  */
@@ -31,7 +31,6 @@ export type ReactNativeFeatureFlagsJsOnly = Readonly<{
   jsOnlyTestFlag: Getter<boolean>,
   animatedDeferStartOfTimingAnimations: Getter<boolean>,
   animatedForceNativeDriver: Getter<boolean>,
-  animatedShouldDebounceQueueFlush: Getter<boolean>,
   animatedShouldSyncValueBeforeStartCallback: Getter<boolean>,
   animatedShouldUseSingleOp: Getter<boolean>,
   deferFlatListFocusChangeRenderUpdate: Getter<boolean>,
@@ -151,11 +150,6 @@ export const animatedDeferStartOfTimingAnimations: Getter<boolean> = createJavaS
  */
 export const animatedForceNativeDriver: Getter<boolean> = createJavaScriptFlagGetter('animatedForceNativeDriver', false);
 
-/**
- * Enables an experimental flush-queue debouncing in Animated.js.
- */
-export const animatedShouldDebounceQueueFlush: Getter<boolean> = createJavaScriptFlagGetter('animatedShouldDebounceQueueFlush', true);
-
 /**
  * When a useNativeDriver animation completes, syncs the JS-side AnimatedValue with the post-animation value BEFORE invoking the user-supplied start({finished}) callback. Without the flag, the callback observes the pre-animation value, which can cause downstream re-renders to read stale interpolation outputs.
  */