Refactor codebase so that we do not repeat code, instead of repeating similar code across multiple runners #230

[rishsriv]

Right now, there are a lot of runners that are inside the runners/ folder. They have a lot of repeated code that can be centralized in one place.

We should clean this up so that the code for runners is DRY and easier to manage.

[theskcd]

I've pushed a new commit (8d3712d) to this PR. Please review the changes.