Add unique species scope and test

[Yuji3000]

🔗 Issue

#1081 Issue Link

✍️ Description

Added scope "unique_species" of an ORG for future conditional rendering of species buttons. Simple test also added to make sure a single species isn't returned more than once.

Directions said to continue to show all species, and what I understand was talks about future implementation. So I didn't go any further. If I misunderstood, let me know.

📷 Screenshots/Demos

[kasugaijin]

@Yuji3000 I see it's still draft so forgive me if I am stating something you intend to work on. This scope looks good. Now we should use this in places where we show the 'See {species}' buttons e.g., the org home page hero section. We should render a button (that sends the correct species param to the controller) for each unique species.

Thanks!