fix: remove failing Parakeet INT8 registry model entries

[ishanvohra2]

What problem does this PR solve?

Removes failing Parakeet INT8 registry entries that return REQUEST_ERROR during model fetch.
Prevents registry consumers from attempting to download unavailable S3 artifacts.

How does it solve it?

Deletes the Parakeet EOU INT8 encoder/decoder model entries from models.prod.json.
Deletes the Parakeet Sortformer INT8 model entry from models.prod.json.

How was it tested?

Validated packages/qvac-lib-registry-server/data/models.prod.json parses as valid JSON after removal.
Confirmed the removed model source paths no longer appear in the registry JSON.

[ishanvohra2]

/review

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ✅ (2/1)
- 1 Team Lead OR Management approval ✅ (1/1)



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*This comment is automatically updated when reviews change.*

[ishanvohra2]

/review