3851 Fix ability to make server side API calls from privacy-center

[eastandwestwind]

Closes #3851 and #3854

Description Of Changes

This change allows us to, most importantly, be able to fetch experience data on the server-side.

Code Changes

• Add new env var FIDES_PRIVACY_CENTER__SERVER_SIDE_FIDES_API_URL to set server-side url host (i.e. from one docker container to another)
• Add new env var FIDES_PRIVACY_CENTER__IS_PREFETCH_ENABLED to determine whether or not to make prefetch calls from server

Steps to Confirm

• Regression test only
• Ensure these env vars are set:

FIDES_PRIVACY_CENTER__DEBUG=true
FIDES_PRIVACY_CENTER__IS_OVERLAY_ENABLED=true
FIDES_PRIVACY_CENTER__IS_PREFETCH_ENABLED=false
FIDES_PRIVACY_CENTER__IS_GEOLOCATION_ENABLED=true
FIDES_PRIVACY_CENTER__GEOLOCATION_API_URL=https://cdn-api.ethyca.com/location
FIDES_PRIVACY_CENTER__PRIVACY_CENTER_URL=http://localhost:3000

• nox -s "fides_env(test)"
• Ensure you have notices / experiences / systems set up for your testing region
• Nav to http://localhost:3001/fides-js-demo.html and see that appropriate experience pops up

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md
• For API changes, the Postman collection has been updated

[cypress]

Passing run #3588 ↗︎

0	4	0	0	0
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Details:

Merge f041bc1 into 3f1ebeb...
Project: fides	Commit: f08a31a5fa ℹ️
Status: Passed	Duration: 01:03 💡
Started: Aug 16, 2023 7:14 PM	Ended: Aug 16, 2023 7:15 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (3f1ebeb) 87.36% compared to head (f041bc1) 87.35%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3895      +/-   ##
==========================================
- Coverage   87.36%   87.35%   -0.02%     
==========================================
  Files         317      317              
  Lines       19431    19431              
  Branches     2497     2497              
==========================================
- Hits        16976    16974       -2     
- Misses       2023     2024       +1     
- Partials      432      433       +1     

see 1 file with indirect coverage changes

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[NevilleS]

Quick comment- but haven't finished reviewing yet 👍

[NevilleS]

Some nits here, but the main two points to get this ready to merge are:

1. We should remove the server-side geolocation logic and test this on some feature branches instead
2. We should set prefetch to false by default, for safety

[NevilleS]

Sorry for forgetting this! Ship it, it's disabled by default, so let's test it out with some staging and production (test) sites