Add possibility to specify what revision of code to checkout

When using the Deployment task, Source Code Checkout it is a requirement for us to toggle when we want latest code or the code that was linked to the specific build where the artifact is coming from.

Scenario:

We want to deploy build 10 but at the moment we are at build 30 and the scripts for making deployment has changed between 10 and 30. If we make a deployment based on 10 but the scripts from 30 then the deployment will most likely fail.