Description

Part of stackabletech/issues#507

Some of the tests were just there to ensure code compiles, but they had no assertions.
This is a good opportunity to use trybuild to make passing and failing code examples.

I have also added docs to the trybuild.rs test which gives hints for test writers who might want to enable syntax highlighting and code completion.

Definition of Done Checklist

# Reviewer
- [ ] Code contains useful comments
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added