Refactor `fides.js` initialization logic

[allisonking]

Closes #

Description Of Changes

Write some things here about the changes and any potential caveats

Code Changes

• [ ] list your code changes here

Steps to Confirm

• [ ] list any manual steps for reviewers to confirm the changes

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