Academy home helper for shared data directory

[GusEllerm]

While brainstorming and developing out auth for the Globus exchange, a small path helper was included in #416. This change pulls that helper out as a more general method for use across different modules, including logging and token storage.

Changes

• Breaking (backwards incompatible changes to public interfaces)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change or feature addition)
• Refactor (internal code or design clean up)
• Documentation (no changes to the code)
• Test (changes or additions to testing)
• Build (change to CI workflows or build processes)
• Package (changes to package metadata or dependency versions)

Pull Request Checklist

Please confirm the PR meets the following requirements.

• Relevant tags are added based on the types of changes.
• Code changes pass pre-commit (e.g., ruff, mypy, etc.).
• Tests have been added to show the fix is effective or that the new feature works.
• New and existing unit tests pass locally with the changes.
• Docs have been updated and reviewed if relevant.

[AK2000]

Looks good to me right now. In the future we might want to rename/refactor into something more general (i.e. environment_helper.py or something like that) but we can make a new PR when we run into that need.