[RFE] Improve documentation of get_environment and User creation in main.rs fir IMDS / OVF Flow and Password Handling

[peytonr18]

Add documentation and tracing to the get_environment function and user creation commands in main.rs to improve clarity around environment detection priority, ie: when we are relying on OVF, that the get_environment function is where we outline the logic for defaulting to OVF if IMDS is unavailable, and so forth. Additionally, highlight that password-based access is disabled, as it isn't necessarily clear that it is unless you review the PR history

This update aims to improve readability and transparency in this area of the codebase, ensuring developers understand the logic and order of environmental checks and default settings.