Feat: Improve script verification coverage

[sedited]

We should add more script tests to verify the error cases on the common script types and exercise some of the script flags better.

[stringintech]

I'd be happy to work on this if you are not working on it already. It would also help me with extending the tests in kernel-bindings-tests.

[sedited]

I have not started with this yet, would be happy to see it integrated there :)