Fix accessibilityState={{expanded: false}} ignored on iOS

[QichenZhu]

Summary:

On iOS, accessibilityState={{ expanded: true }} works as expected, but accessibilityState={{ expanded: false }} is ignored. That means the collapsed state is not announced by VoiceOver, so users may not know the element can be expanded.

Fixes #56296

Changelog:

[IOS] [FIXED] - accessibilityState={{expanded: false}} ignored on iOS

Test Plan:

import type {RNTesterModuleExample} from '../../types/RNTesterTypes';

import * as React from 'react';
import {Pressable, Text, View} from 'react-native';

function Playground() {
  return (
    <View style={{flex: 1, alignItems: 'center', justifyContent: 'center'}}>
      <Text>1. accessibilityState=&#123;"expanded": true&#125;</Text>
      <Pressable
        accessibilityState={{expanded: true}}
        style={{
          backgroundColor: 'lightgrey',
          margin: 16,
          marginBottom: 64,
          padding: 8,
        }}>
        <Text>Element 1</Text>
      </Pressable>
      <Text>2. accessibilityState=&#123;"expanded": false&#125;</Text>
      <Pressable
        accessibilityState={{expanded: false}}
        style={{
          backgroundColor: 'lightgrey',
          margin: 16,
          padding: 8,
        }}>
        <Text>Element 2</Text>
      </Pressable>
    </View>
  );
}

export default {
  title: 'Playground',
  name: 'playground',
  description: 'Test out new features and ideas.',
  render: (): React.Node => <Playground />,
} as RNTesterModuleExample;

1. Put the code into packages/rn-tester/js/examples/Playground/RNTesterPlayground.js.
2. Build and run RNTester on the iOS Simulator.
3. Open Xcode > Open Developer Tool > Accessibility Inspector.
4. Click Select an element to inspect and choose Element 1.
5. Verify Value is expanded.
6. Click Select an element to inspect and choose Element 2.
7. Verify Value is collapsed.

[cipolleschi]

Thanks for fixing this!

[meta-codesync]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this in D100784135.