Use team_links_from_group helper to simplify categories page

Why is this change being made?

I added team_links_from_group in !43405 (merged) because repeating the map / join combination everywhere seems annoying 🙂

How will this merge request impact page speed?

This gives the same output as before.

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what