Give us more info in a changeset

### Name of the resource

Other

### Resource name

_No response_

### Description

Changesets are not near as helpful as they could be. It tells us what item would change and the scope but doesn't tell us what is actually changing. Terraform does a way better job of this by telling us what actual values will change. Why can't we have this in cloudformation?

### Other Details

_No response_

The issue provides no repository files, tests, or entry points to inspect. Clarify which CloudFormation changesets and resource values should be exposed, then define acceptance criteria for showing actual before-and-after values.

Written by the indexing model from the issue text.