Refactor Concourse folder structure

[malston]

This folder structure is makes it a little easier to tell which shell scripts are tasks and which are shared. I find it a little easier to navigate in an editor as well. Thoughts?

[marcingrzejszczak]

@nebhale @philwebb @mbhave - you are Concourse experts - what do you think about this change? Does the pipeline look more Concourse like? As a reminder: one of the issues with Spring Cloud Pipelines and Concourse was the fact that I initially wrote it in the way I work with Jenkins. The idea of this PR is to refactor the current Concourse structure to better reflect the way developers work with it.

[mbhave]

@marcingrzejszczak I prefer having a scripts folder and a tasks folder to separate the yml and shell scripts. Somewhat similar to what concourse itself does for its CI here but with the .yml files put in a tasks folder instead.

[philwebb]

Same here. Here's how artifactory-resource is structured

[marcingrzejszczak]

@malston says that some of the Labs teams are working like the way he presented. I guess it's not a gigantic difference between the 2 approaches, isn't it?