Using What If deployment with the Visualizer

I feel as though it would be great to have the ability to use our What If deployment logic to show a visual indicator of what will change in the architecture of a deployment including the specific attributes that may change.

This could either be a split view side by side, or it could be the architecture that is similar to Git Diff. So removed attributes or resources will be red, added attributes and resources will be green. Any attributes that previously existed but changed will have the previous value in red and display the new value in green

This will be related to #6215

Begin by reviewing related issue #6215 and the existing What If deployment and Visualizer entry points. Define the desired architecture-diff view and its treatment of removed, added, and changed resources or attributes; completion should show those differences clearly.

Written by the indexing model from the issue text.