SDK generation tests don't account for file additions

[zengin]

The comparison is based on the expected files, i.e. it walks through the expected files and checks whether those exist in the output folder

But if there is a type addition, then expected data becomes a subset, but the tests still pass if none of the existing files were modified.

To avoid this, we should compare if the file tree exactly matches between expected and actual output folders.
AB#8154