[Issue #2819] disable ga in test

[doug-s-nava]

Summary

Fixes #2819

Time to review: 15 mins

Changes proposed

This reorganizes how the application will grab Google Analytics IDs in difference scenarios in order to solve issues where non-production analytics data was making it into the production GA account. I laid out the scenarios in a comment on the ticket here #2819 (comment).

The change basically consists of removing GA IDs from Next code or .env files, and moving it to SSM / terraform.

This also adds some documentation, and removes an unused environment variable, both of which should hopefully reduce confusion and help to reduce the chance of this kind of problem down the line.

Context for reviewers

Test steps

4. run npm run dev and click around the app
5. run npm run build && npm start and click around the app
6. VERIFY: using omnibug or similar tool, verify that no requests to GA are going out

Beyond this it is difficult to test without merging the change and checking GA after 24 hours, but that can be done if folks think it's necessary.

1. merge the change
2. wait 24 hours
3. VERIFY: GA prod account no longer shows any traffic coming from localhost

Additional information

Screenshots, GIF demos, code examples or output to help show the changes working as expected.

[mdragon]

This was worse than I expected but I like where you arrived at.