Created by: tharakawj
In #2515, we removed react-error-overlay from the dependency list of react-scripts, and now it's only included via react-dev-utils. This causes kitchensink test to download and use published react-error-overlay package from NPM instead of using the local package since replace-own-deps.js can't handle it anymore. As a result, the test fails when there are changes that need sync in the local react-error-overlay and react-dev-utils packages (#3100).
This PR fixes the issue by linking the local package with npm link.