Unit Tests for /columns API Endpoint

[karkir0003]

Unit tests for /columns Dataset API Endpoint

Github Issue Number Here: #1059
What user problem are we solving?
Currently, we have unit tests in pytest for the core training files. However, to increase test coverage on our backend, we should add unit tests for the Django training endpoints we have in the codebase.

What solution does this PR provide?
Unit tests for the /columns API Route under /api/datasets/default/columns endpoint.

Testing Methodology
Checkout this branch on your local machine and then run cd training && pytest tests/ at the root of the project

Any other considerations
For any utility files that are created for the purpose of being reused across unit tests within training/ please add it under test_utils.py (see example functions I've added)

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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