fix: add deduplication for test_models_owners

Address CodeRabbit review comment: restore the unique filter for
test_models_owners to ensure no duplicate owners appear in model_owners,
maintaining backward compatibility with the original behavior.

Co-Authored-By: Yosef Arbiv <[email protected]>

Author: devin-ai-integration[bot]

macros/edr/dbt_artifacts/upload_dbt_tests.sql

@@ -145,6 +145,7 @@
             {% endif %}
         {%- endif -%}
     {%- endif -%}
+    {% set test_models_owners = test_models_owners | unique | list %}
 
     {%- if primary_test_model_database is none or primary_test_model_schema is none -%}
         {# This is mainly here to support singular test cases with multiple referred models, in this case the tested node is being used to extract the db and schema #}