RN: Fix TouchableHighlight w/o onLongPress

Summary:
When `TouchableHighlight` was migrated to use `Pressability`, a bug was introduced due to `onLongPress` being unconditionally supplied as a callback. This bug leads to `onPress` not firing if the element is pressed for longer than 500ms, even when `onLongPress` is not supplied.

Closes #29040.

Changelog:
[General][Fixed] - TouchableHighlight fires `onPress` when pressed for >500ms, when `onLongPress` is not supplied.

Reviewed By: TheSavior

Differential Revision: D23664365

fbshipit-source-id: 3a0e92e276871eedd303888346a13433be15ac47

Libraries/Components/Touchable/TouchableBounce.js

@@ -72,11 +72,7 @@ class TouchableBounce extends React.Component<Props, State> {
           this.props.onFocus(event);
         }
       },
-      onLongPress: event => {
-        if (this.props.onLongPress != null) {
-          this.props.onLongPress(event);
-        }
-      },
+      onLongPress: this.props.onLongPress,
       onPress: event => {
         const {onPressAnimationComplete, onPressWithCompletion} = this.props;
         const releaseBounciness = this.props.releaseBounciness ?? 10;

Libraries/Components/Touchable/TouchableHighlight.js

@@ -193,11 +193,7 @@ class TouchableHighlight extends React.Component<Props, State> {
           this.props.onFocus(event);
         }
       },
-      onLongPress: event => {
-        if (this.props.onLongPress != null) {
-          this.props.onLongPress(event);
-        }
-      },
+      onLongPress: this.props.onLongPress,
       onPress: event => {
         if (this._hideTimeout != null) {
           clearTimeout(this._hideTimeout);