Address review of AI-generated code

[porridge]

As a follow-up from a comment in a design document for stackrox installation method consolidation, a couple of months ago or so I performed a review of the early roxie code-base generated using AI.

Some of the result of this was already merged in:

• chore: use an enum for component #55
• chore: various improvements #56
• chore: pkg/ -> internal/ #10
• Fix test, don't delete docker config #70

The remaining comments were added as TODOs in:

• WiP: review of the whole codebase #42

This serves as a reminder to address these.