fix(m365): Correct issues when specifying input_storage_container_url

[jacdavi]

🗣 Description

• Fix Terraform attempting to upload tenant files when input_storage_container_url is specified
• Fix output variable for input_storage_container_url being set incorrectly
• Updates variable descriptions to provide more clarity on how to set input_storage_container_url
  • Update tf_vars_to_adoc.py helper script to support version 8+ python-hcl2

💭 Motivation and context

Closes #30

🧪 Testing

Verified successful deployment with a separate input container

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• PR targets the correct parent branch (e.g., main or release-name) for merge.
• Changes are limited to a single goal - eschew scope creep!
• Changes are sized such that they do not touch excessive number of files.
• All future TODOs are captured in issues, which are referenced in code comments.
• Related issues these changes resolve are linked preferably via closing keywords.
• All relevant repo and/or project documentation updated to reflect these changes.
• All automated checks (e.g., linting, static analysis, unit/smoke tests) passed.

✅ Post-merge checklist

• Feature branch deleted after merge to clean up repository.
• Verified that all checks pass on parent branch (e.g., main or release-name) after merge.