Have Tails Verification handle IDFs with several Tails installation paths (ISO/IMG)

(or one IDF that references both the ISO and .img) including:
- make it easier for the next developer to get started working on this code base

Reviewer and rubber-duck: intrigeri
Release :sajolida:

Feature Branch: verification-extension.git:usbimage

Original created by @u on 15995 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information