Ensure user input is sanitized

[UncleGedd]

Describe what should be investigated or refactored

The biggest issue is that the path key in a uds-bundle.yaml is not sanitized, which could potentially lead to path traversal vulnerabilities.

• Go through the codebase and standardize filepath sanitization where necessary (look for user input)

Additional context

#453 (comment)

[naveensrinivasan]

Google released a library for safe opening https://github.com/google/safeopen

https://bughunters.google.com/blog/4925068200771584/the-family-of-safe-golang-libraries-is-growing

cc @bburky