Remove enableImperativeEvents_DEPRECATED feature flag (#59183)

Summary:
Pull Request resolved: #59183

The JS-only `enableImperativeEvents_DEPRECATED` flag was kept so JS bundles delivered to older native builds, where the common `enableImperativeEvents` flag was unavailable, could still enable the feature. Those builds are gone, so remove the deprecated flag and gate `ReactNativeElement` and `ReadOnlyText` solely on the common flag.

Changelog: [Internal]

Reviewed By: javache

Differential Revision: D126047688

fbshipit-source-id: 7a35822b2fafb4535bd309677730c9b8c4d349cc

Author: rubennorte

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

@@ -1116,16 +1116,6 @@ const definitions: FeatureFlagDefinitions = {
       },
       ossReleaseStage: 'none',
     },
-    enableImperativeEvents_DEPRECATED: {
-      defaultValue: false,
-      metadata: {
-        description:
-          'Deprecated in favor of the common flag with the same name, which is the one that can be configured by OSS release stage. This is only kept so JS bundles delivered to older native builds, where the common flag is unavailable, can still enable the feature.',
-        expectedReleaseValue: true,
-        purpose: 'release',
-      },
-      ossReleaseStage: 'none',
-    },
     enableNativeEventTargetEventDispatching: {
       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<<4eb26b4190d023d26a50f54b6e3ea5eb>>
+ * @generated SignedSource<<f36d78d946c018d3dd3fc30f6071ee76>>
  * @flow strict
  * @noformat
  */
@@ -34,7 +34,6 @@ export type ReactNativeFeatureFlagsJsOnly = Readonly<{
   animatedKeepListenersOnDetach: Getter<boolean>,
   animatedShouldSyncValueBeforeStartCallback: Getter<boolean>,
   deferFlatListFocusChangeRenderUpdate: Getter<boolean>,
-  enableImperativeEvents_DEPRECATED: Getter<boolean>,
   enableNativeEventTargetEventDispatching: Getter<boolean>,
   externalElementInspectionEnabled: Getter<boolean>,
   fixCrossOrientationNestedListViewability: Getter<boolean>,
@@ -176,11 +175,6 @@ export const animatedShouldSyncValueBeforeStartCallback: Getter<boolean> = creat
  */
 export const deferFlatListFocusChangeRenderUpdate: Getter<boolean> = createJavaScriptFlagGetter('deferFlatListFocusChangeRenderUpdate', false);
 
-/**
- * Deprecated in favor of the common flag with the same name, which is the one that can be configured by OSS release stage. This is only kept so JS bundles delivered to older native builds, where the common flag is unavailable, can still enable the feature.
- */
-export const enableImperativeEvents_DEPRECATED: Getter<boolean> = createJavaScriptFlagGetter('enableImperativeEvents_DEPRECATED', false);
-
 /**
  * When enabled, the React Native renderer dispatches events through the W3C EventTarget API (addEventListener/dispatchEvent) instead of the legacy plugin-based system.
  */

packages/react-native/src/private/webapis/dom/nodes/ReactNativeElement.js

@@ -360,14 +360,12 @@ ReactNativeElement_public.prototype = ReactNativeElement.prototype;
 // `removeEventListener`, `dispatchEvent`) is only inherited by this final class
 // when `enableNativeEventTargetEventDispatching` is enabled (which makes
 // `ReadOnlyNode` extend `EventTarget`). Until that public API is finalized, it
-// is gated behind `enableImperativeEvents` (or its deprecated JS-only
-// counterpart, `enableImperativeEvents_DEPRECATED`): when both flags are off we
-// remove those methods from this final class. Native/internal event dispatch
-// does not rely on these public methods, so removing them is safe.
+// is gated behind `enableImperativeEvents`: when off we remove those methods
+// from this final class. Native/internal event dispatch does not rely on these
+// public methods, so removing them is safe.
 if (
   ReactNativeFeatureFlags.enableNativeEventTargetEventDispatching() &&
-  !ReactNativeFeatureFlags.enableImperativeEvents() &&
-  !ReactNativeFeatureFlags.enableImperativeEvents_DEPRECATED()
+  !ReactNativeFeatureFlags.enableImperativeEvents()
 ) {
   const prototype: interface {
     addEventListener?: unknown,

packages/react-native/src/private/webapis/dom/nodes/ReadOnlyText.js

@@ -45,14 +45,12 @@ ReadOnlyText_public.prototype = ReadOnlyText.prototype;
 // `removeEventListener`, `dispatchEvent`) is only inherited by this final class
 // when `enableNativeEventTargetEventDispatching` is enabled (which makes
 // `ReadOnlyNode` extend `EventTarget`). Until that public API is finalized, it
-// is gated behind `enableImperativeEvents` (or its deprecated JS-only
-// counterpart, `enableImperativeEvents_DEPRECATED`): when both flags are off we
-// remove those methods from this final class. Native/internal event dispatch
-// does not rely on these public methods, so removing them is safe.
+// is gated behind `enableImperativeEvents`: when off we remove those methods
+// from this final class. Native/internal event dispatch does not rely on these
+// public methods, so removing them is safe.
 if (
   ReactNativeFeatureFlags.enableNativeEventTargetEventDispatching() &&
-  !ReactNativeFeatureFlags.enableImperativeEvents() &&
-  !ReactNativeFeatureFlags.enableImperativeEvents_DEPRECATED()
+  !ReactNativeFeatureFlags.enableImperativeEvents()
 ) {
   const prototype: interface {
     addEventListener?: unknown,