fix: 1396 search endpoint returning uid as id instead of stable id for latest dataset an redirects

[qcdyx]

Summary:

Closes #1396

Expected behavior:
latest_dataset_id and redirect_ids's target_id should be displayed as stable_id, not unique id.

Testing tips:

Provide tips, procedures and sample files on how to test the feature.
Testers are invited to follow the tips AND to try anything they deem relevant outside the bounds of the testing tips.

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• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
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[davidgamez]

LGTM!