Move RefreshControlMock into Jest preset files (#51530)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51530

Alternative to https://github.com/facebook/react-native/pull/50784.

`__mocks__` (and other underscored dirs) are correctly excluded from our npm package via `package.json#files`. But in this instance, this is a source file for the `jest/` directory (Jest preset within `react-native`), and should be included — fix by relocating.

Changelog:
[General][Fixed] - Fix missing RefreshControlMock source in Jest preset

Reviewed By: rshest

Differential Revision: D75215731

fbshipit-source-id: 1240344c4236288f31b16513f4df16766ad1e571

packages/react-native/jest/RefreshControlMock.js

@@ -4,29 +4,29 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @format
  * @flow strict-local
+ * @format
  */
 
 'use strict';
 
-import type {HostComponent} from '../../../../src/private/types/HostComponent';
+import type {HostComponent} from '../src/private/types/HostComponent';
 
-import requireNativeComponent from '../../../ReactNative/requireNativeComponent';
+import requireNativeComponent from '../Libraries/ReactNative/requireNativeComponent';
 import * as React from 'react';
 
 const RCTRefreshControl: HostComponent<{}> = requireNativeComponent<{}>(
   'RCTRefreshControl',
 );
 
-class RefreshControlMock extends React.Component<{...}> {
+export default class RefreshControlMock extends React.Component<{...}> {
   static latestRef: ?RefreshControlMock;
+
+  render(): React.Node {
+    return <RCTRefreshControl />;
+  }
+
   componentDidMount() {
     RefreshControlMock.latestRef = this;
   }
-  render(): React.MixedElement {
-    return <RCTRefreshControl />;
-  }
 }
-
-module.exports = RefreshControlMock;

packages/react-native/jest/setup.js

@@ -201,9 +201,7 @@ jest
   }))
   .mock('../Libraries/Components/RefreshControl/RefreshControl', () => ({
     __esModule: true,
-    default: jest.requireActual(
-      '../Libraries/Components/RefreshControl/__mocks__/RefreshControlMock',
-    ),
+    default: jest.requireActual('./RefreshControlMock').default,
   }))
   .mock('../Libraries/Components/ScrollView/ScrollView', () => {
     const baseComponent = mockComponent(