RN: Upgrade AccessibilityInfo.removeEventListener Call Sites

Summary:
Upgrades all users of `AccessibilityInfo.removeEventListener` to instead use the return value of `AccessibilityInfo.addEventListener`. This will avoid soft errors from being fired for Facebook products.

Changelog:
[Internal]

Reviewed By: kacieb

Differential Revision: D27595097

fbshipit-source-id: 7133db83c6313ae04e43fc0cc8667f562ba1af2b

packages/rn-tester/js/examples/Accessibility/AccessibilityExample.js

@@ -837,7 +837,7 @@ class EnabledExample extends React.Component<{}> {
   };
 
   componentDidMount() {
-    AccessibilityInfo.addEventListener(
+    this._subscription = AccessibilityInfo.addEventListener(
       this.props.eventListener,
       this._handleToggled,
     );
@@ -853,10 +853,7 @@ class EnabledExample extends React.Component<{}> {
   }
 
   componentWillUnmount() {
-    AccessibilityInfo.removeEventListener(
-      this.props.eventListener,
-      this._handleToggled,
-    );
+    this._subscription?.remove();
   }
 
   _handleToggled = isEnabled => {