fix(m365): update example directory to have all defined variables

[jacdavi]

🗣 Description

Updates m365 Terraform example environment files to include all defined variables.

Previously, variables.tf was missing output_storage_container_sas
main.tf was also missing firewall, output_storage_container_sas, create_app, container_memory_gb, and prefix_override

Additionally, main.tf was updated so variables appear in the same order as the variables files

💭 Motivation and context

Not all options were properly exposed prior to this change. Closes #28

🧪 Testing

Verified all variables now included. Also verified terraform apply still worked as expected.

✅ 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.