Change wandb env var to properly disable at start of testing

[joeloskarsson]

Describe your changes

Tests are not working properly as wandb without any user logged in are making them crash. This should not happen, since we disable WANDB with env var when running the tests, but that variable is wrong. This is an attempt to fix that, to make sure wandb is disabled when running tests.

Issue Link

None

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📖 Documentation (Addition or improvements to documentation)

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• My branch is up-to-date with the target branch - if not update your fork with the changes from the target branch (use pull with --rebase option if possible).
• I have performed a self-review of my code
• For any new/modified functions/classes I have added docstrings that clearly describe its purpose, expected inputs and returned values
• I have placed in-line comments to clarify the intent of any hard-to-understand passages of my code
• I have updated the README to cover introduced code changes
• I have added tests that prove my fix is effective or that my feature works
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• the code is readable
• the code is well tested
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• I have added a line to the CHANGELOG describing this change, in a section
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Checklist for assignee

• PR is up to date with the base branch
• the tests pass
• author has added an entry to the changelog (and designated the change as added, changed or fixed)
• Once the PR is ready to be merged, squash commits and merge the PR.

[joeloskarsson]

Seems to be working 😄

[khintz]

Do we want an entry to the changelog? Even though it is a tiny change I always prefer that.

[joeloskarsson]

Yes, already on it 😀 Just wanted to see that it worked first.

[khintz]

Approving under the assumption all tests will pass again.