Tests: add test that option classes aren't reused

[alwaysintreble]

What is this fixing or adding?

Prevents worlds from reusing the exact same option class in their available options. This becomes problematic when trying to use Option Groups since all the grouping happens via the actual class and not the dataclass's attributes. Namely #3393

How was this tested?

Ran tests a few times, added a duplicate option and removed it ensuring it behaved how I expected.

[Silvris]

Should this ignore Removed? Unsure if they go into Game options by default like other options, but it is the main use I can see of a duplicate class.

[alwaysintreble]

it ignores Visibility.none entirely

[Exempt-Medic]

This should work now btw