Update app to use node 18 and npm 8

[sarinapadilla]

Issue description

Update the engines in package.json to the new versions, and update the GH workflow. We will also have to update package-lock.json to use the new npm format.

As part of this ticket, we need to update to the newest release of the cgov-react-app-playground shared workflow.

ESTIMATE 2

Additional details / screenshot

• ![Screenshot]()

Related Tickets

• React App Playground: https://github.com/NCIOCPL/cgov-react-app-playground/issues/56

[sarinapadilla]

Closing this ticket as it is a duplicate of #147.