Policy-aware traversal

[galvana]

Closes LA-283

Description Of Changes

Updates the Traversal model to allow nodes that don't contain user data categories to be uncreachable.

Code Changes

• list your code changes here

Steps to Confirm

1. list any manual steps for reviewers to confirm the changes

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration This indicates that a change includes a database migration label to the entry if your change includes a DB migration
  • Add a high-risk This issue suggests changes that have a high-probability of breaking existing code label to the entry if your change includes a high-risk change (i.e. potential for performance impact or unexpected regression) that should be flagged
• Followup issues:
  • Followup issues created (include link)
  • No followup issues
• Database migrations:
  • Ensure that your downrev is up to date with the latest revision on main
  • Ensure that your downgrade() migration is correct and works
    • If a downgrade migration is not possible for this change, please call this out in the PR description!
  • No migrations
• Documentation:
  • Documentation complete, PR opened in fidesdocs
  • Documentation issue created in fidesdocs
  • If there are any new client scopes created as part of the pull request, remember to update public-facing documentation that references our scope registry
  • No documentation updates required

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
fides-plus-nightly	⬜️ Ignored (Inspect)			Jan 20, 2025 5:02pm