feat(m365): add separate directory for adhoc scans

[jacdavi]

🗣 Description

• Adds separate adhoc and scheduled directories in the input storage container. Container instances will only run on configs in their respective directory.
  • Upload local files to both directories, plus a meta file to keep directory structure
• Filter input to only yaml/json. Fix error if no configs to read

💭 Motivation and context

Provides a mechanism to run adhoc scans on a subset of tenants. Closes #7

🧪 Testing

Confirmed container instances read from specified directories. Tested running contain with no config files

✅ 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.