fix(jest-env): pass exportConditions (facebook#35203)

Summary:
Like discussed in react-native-community/discussions-and-proposals#509, RN should override the default `node` and `node-addons` conditions.

You might consider supporting (or just setting) [`customExportConditions`](https://github.com/facebook/jest/blob/4670d3be0d80d47844673eb163666253e788f006/packages/jest-environment-node/src/index.ts#L187-L189) instead, but the default of the node env should be overwritten 🙂

## Changelog

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[General] [Changed] - use `'react-native'` export conditions in Jest environment

Pull Request resolved: facebook#35203

Test Plan: Green CI?

Reviewed By: lunaleaps

Differential Revision: D41081783

Pulled By: jacdebug

fbshipit-source-id: 844c70d92a58c5432ba5b9e5e99c8f50045ef8ac

Author: SimenB

jest/react-native-env.js

@@ -12,5 +12,7 @@
 const NodeEnv = require('jest-environment-node').TestEnvironment;
 
 module.exports = class ReactNativeEnv extends NodeEnv {
-  // this is where we'll add our custom logic
+  exportConditions() {
+    return ['react-native'];
+  }
 };