LCORE-2310: Refactor source resolution utility

[asimurka]

Description

Refactors source resolution utility function to use only result attributes so that it is reusable for pydantic-based handler.

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement
• Benchmarks improvement

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Related Tickets & Documents

• Related Issue # LCORE-2310
• Closes #

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Reviewing files that changed from the base of the PR and between 4920d68 and 3a04812.

📒 Files selected for processing (2)

• src/utils/responses.py
• tests/unit/utils/test_responses.py

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[asimurka]

result is always an object

[asimurka]

Pass only attributes dict for more general usage. Pydantic uses native openai models while llama stack uses its own (mirrored) types.

[tisnik]

LGTM