Use PATH from session in runnerv2 and beta commands

[adambabik]

This PR additionally contains some refactoring in the command and system packages.

Closes https://github.com/stateful/runme/issues/571

[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
81.7% Coverage on New Code
0.4% Duplication on New Code

See analysis details on SonarCloud