Switch from Universal Analytics to Google Analytics 4

[sunu]

addresses NASA-IMPACT/nasa-apt#807

[sunu]

Looks like react-ga4 is not a drop-in replacement of react-ga as some of the helper functions we use are missing. This PR needs further changes to port our code over to use react-ga4

[sunu]

react-ga4 recommends using the google analytics plugin for debugging to log the events. But I couldn't get it to log anything

[vgeorge]

@sunu this is working well for me. To test it locally, add the GA tracking code to config/local.js, open devtools and inspect the outgoing request to Google Analytics. Please notice that this PR will enable GA tracking to the staging environment only. If we desire to add it to production, a tracking code must be added to config/production.js.

[sunu]

@vgeorge Awesome! We should also figure out how to handle ReactGA.OutboundLink. I believe that's not defined in react-ga4?

[vgeorge]

Let's address the outbound method issue in separate, it doesn't look like it is blocking this merge.