draft: switch taxonomy and dataset endpoints to be non-async

[adamsachs]

Closes []

Description Of Changes

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Code Changes

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Steps to Confirm

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Pre-Merge Checklist

• Issue requirements met
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• CHANGELOG.md updated
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  • Updates unreleased work already in Changelog, no new entry necessary
• Followup issues:
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  • No migrations
• Documentation:
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Project	Deployment	Review	Updated (UTC)
fides-plus-nightly	Ready	Preview, Comment	Dec 23, 2025 4:57pm

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
fides-privacy-center	Ignored		Dec 23, 2025 4:57pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.17%. Comparing base (cfbf98a) to head (1678422).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6764   +/-   ##
=======================================
  Coverage   87.17%   87.17%           
=======================================
  Files         535      535           
  Lines       35330    35330           
  Branches     4113     4113           
=======================================
  Hits        30800    30800           
  Misses       3639     3639           
  Partials      891      891           

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