Remove global config from tests

[neubig]

What is the problem that this fixes or functionality that this introduces? Does it fix any open issues?

This PR removes the global config file from a few remaining tests.

Other references

Part of #2758

[yufansong]

LGTM, thanks!

[tobitege]

Hello @neubig ,
I'm surprised this got merged without below test failing. 🤔

poetry run pytest -svvv ./tests/test_fileops.py

runs into error because the signature of files.resolve_path was changed in #3039 .

    def test_resolve_path():
>       assert (
            files.resolve_path('test.txt', '/workspace')
            == Path(WORKSPACE_BASE) / 'test.txt'
        )
E       TypeError: resolve_path() missing 2 required positional arguments: 'workspace_base' and 'workspace_mount_path_in_sandbox'