Diff demo

[therealryan]

In #567, we made a change to the example system that resulted in a change to the test-data model.
We manually saved one of the resulting execution reports into the pages branch, resulting in this persistent record of the updated model.

Now we can write documentation about what the model-diff tool does while pointing to a less contrived worked example

In the process we noticed that:

• Report naming api #559 had created a new execution report that the publish action was picking up. It's not interesting, so we've limited the action to scanning only in the example module.
• Whitespace was being collapsed in the diff analysis view, leading to "why are these identical-looking changes not being collated?" confusion

Resolves #462

[sonarqubecloud]

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