fix(test-tools): fix uv sync when building fixtures for releases

[fselmo]

🗒️ Description

We've since moved the testing framework package to dev dependencies which are installed by default with a uv sync. This PR removes the old install extra call for test which no longer exists.

This was tested already in the latest bal release here. Previous fail without this change here.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

Cute Animal Picture

[spencer-tb]

LGTM! Thanks.

[danceratopz]

Thanks for this! Sorry that this got missed!