Upgrade react-scripts to 4.0.2

[olipyskoty]

Contributing to Twilio

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Pull Request Details

JIRA link(s):

• VIDEO-3796

Description

• Updated react-scripts from version 3.4.4 to 4.0.2
• This update includes the "fast-refresh" functionality which allows for updates to be made to the code without having to reload the entire page (checkout the gif in this PR!)
• Found that we couldn't upgrade react-scripts using npm7. Fixed this by downgrading to node version 12 which downgraded npm to version 6
• This change also made an update to the tsconfig.json file

Burndown

Before review

• Updated CHANGELOG.md if necessary
• Added unit tests if necessary
• Updated affected documentation
• Verified locally with npm test
• Manually sanity tested running locally
• Included screenshot as PR comment (if needed)
• Ready for review

Before merge

• Got one or more +1s
• Re-tested if necessary

[timmydoza]

Looks good! The fast refresh feature will come in handy.