PROD-1452- Refactor: extract out getting custom preferences from getting override options

[eastandwestwind]

Closes https://ethyca.atlassian.net/browse/PROD-1452

Description Of Changes

Refactors getting custom preferences from getting override options such that the API call does not delay our ability to initialize our CMP lib.

Code Changes

• Refactor GET call out from getting override options
• Add DEFER comment to explicitly say we currently don't support overriding notice-based custom consent prefs from our getPreferencesFn function.

Steps to Confirm

• Define a custom get preferences override function for fides.js
• Call the Fides.init(...) function and provide the override params
• Immediately after calling init(), check if __tcfapi is defined

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

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
fides-plus-nightly	⬜️ Ignored (Inspect)	Visit Preview		Dec 4, 2023 11:47am

[cypress]

Passing run #5454 ↗︎

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Details:

Merge 6fcaa35 into ed32558...
Project: fides	Commit: f544b9c98a ℹ️
Status: Passed	Duration: 00:34 💡
Started: Dec 4, 2023 11:57 AM	Ended: Dec 4, 2023 11:58 AM

Review all test suite changes for PR #4466 ↗︎

[allisonking]

lgtm!