smoke_test: Fix Failure on Windows GitHub Workflow

[rlxdev]

🗣 Description

Fixed the smoke test for the Windows workflow by correcting the use of the Python virtual environments for both OS flows. GitHub uses 2 drives in its VM/container when running a workflow on Windows, and it looks like OPA isn't handling it correctly when the current working directory is on one drive and is being passed input files on another drive. Regardless, we should be using the Python virtual environment correctly, and this fix takes care of the OPA issue as well (because OPA is run with the current working directory on the same drive as the input data).

The default OPA version used in the smoke test has been updated to v1.0.0. We really should be running the latest version of OPA for this test so we can catch any OPA issues before ScubaGoggles users encounter them.

Closes #529

🧪 Testing

Ran the smoke test workflow with both macOS and Windows runners and the tests complete successfully.

✅ Pre-approval checklist

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• Changes are limited to a single goal - eschew scope creep!
• If applicable, All future TODOs are captured in issues, which are referenced in the PR description.
• The relevant issues PR resolves are linked preferably via closing keywords.
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• All new and existing tests pass.

✅ Pre-merge Checklist

• This PR has been smoke tested to ensure main is in a functional state when this PR is merged.
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✅ Post-merge Checklist

• Delete the branch to clean up.
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