Refactor all shell command from subprocess to sh library to better manage process and close sessions

[stikkireddy]

• there are some paths where we want the commands to be in a new session and other scenarios where we want the session to be managed to the parent group.
• there are too many various sections of the code that use subprocess and reimplement the same logic of spawning a new shell command, deciding whether it should be background or foreground, whether it should have a new session or not and if it should have env variables injected or not. Also sometimes you may want to display logs (debugging) and some times not.
• Ideally we can refactor this into a separate module to focus on handling all these tasks