[Refactor] pytest fixture naming to comply with PT021

[drona-gyawali]

Part of #10196

• Improved readability and maintainability of pytest fixtures.
• Standardized fixture structure by adopting yield-based cleanup where appropriate.

Technical

• Refactored fixtures to use yield where sequential cleanup improves clarity.
• Removed redundant request.addfinalizer calls where yield could handle resource cleanup.
• https://docs.astral.sh/ruff/rules/pytest-fixture-finalizer-callback/

Testing

• Ensured ruff check . passes without errors.
• Run pre-commit run --all-files to see what needs to be fixed

Screenshot

N/A

Stakeholders

• @RayBB

[RayBB]

One small change suggestion but otherwise this is great! Good job with this one :)

I think it certainly makes thinks clearer for someone working with these test 👍

Now we just need staff to review/merge.