[Bug]: Ensure `pyproject.toml` is correct as part of CI for PRs.

What happened?

The dependencies in requirements.txt and pyproject.toml must match in order for the project to work correctly in development and when deployed.

However, there is currently no automated mechanism for ensuring that this is the case, except for the build-and-release job, which only runs on main.

We should call the bin/test-package.sh script as part of our CI on PRs to avoid this in the future.

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Relevant log output

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