Figure out how to make it easier for clients on older versions to leapfrog to latest

[gwright99]

Having clients upgrade their installer version is generally a good thing since newer Releases have improved security and functionality. Unfortunately, IMO, the current approach (grab latest release, run Terraform plan, and see what it complains about) is not super professional and should be improved.

Given that this tool is designed to keep most client configuration constrained to the terraform.tfvars and omnibus SSM objects, it shouldn't be too difficult to provide a diff(s) outlining all the necessary changes. We should figure out how to do this in a clean and repeatable way.

[gwright99]

Idea: Use the extractor logic used for validation and use it to diff the keys between the client's tfvars file and the latest project variables.tf file.