(#372) Fix issues in AboutEnumeration (#373)

* ♻️ Cleanup old test file

Refactor slightly, match file more to current style.

Rename a few tests to make more sense.

* ✅ Add regression test

We can test file ASTs during our static analysis checks.

Added a test to check we don't have any nested It blocks in the file.

* 🐛 (#372) Fix missing / extra brace

* 📝 🎨 Adjust AboutEnumeration formatting

* 🐛 (#372) Delay parsing of enum

Using a raw scriptblock will break the parser in earlier versions.

Fix is to define it as a string and parse that just before execution.