Installation and Linux Makefile improvements

[jordancarlin]

CI

• Add custom user level installation to CI
• Ensure installation CI logs are always uploaded if installation fails

Installation

• Don't suggest looking in the log file if it doesn't exist + log more installation
• Refactor helper functions for increased readability and maintainability
• Update download methods (git and wget/curl) for increased robustness with transient network issues (sometimes experienced by GitHub Actions runners)

Linux Makefile

• Remove old cleanDriver rule
• Add environment variable validation to ensure setup.sh has been sourced or make is run by installation script (@stineje this address what we were discussing)

[jordancarlin]

The CI failure for Ubuntu 20.04 is due to an upstream change that broke compatibility with old GCC unrelated to these changes. I’ve opened a PR to fix it. All other CI tests are passing.