Add unit test for tune in the katib_client module

[tariq-hasan]

What you would like to be added?

We need to add unit test for the tune function in the katib_client module.

Why is this needed?

Parent issue: Add unit tests to the Katib SDK #2184

Unit tests already implemented:

• Add unit test for create_experiment in the katib_client module #2325

Bugs due to missing unit tests:

• [SDK] Fix empty list for env variables and numpy version #2360

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[andreyvelich]

This has been completed by: #2399.