Include partner's name on copy stating bidders agree to Artsy's COS

[yuki24]

addresses https://artsyproduct.atlassian.net/browse/AUCT-771

Todos

• [x] Add more test coverage
• [x] Fix type errors
• [x] Add screenshots

Screenshots

[yuki24]

Alright, the builds are green and I added screenshots, and how this is ready for review.

[yuki24]

It might be a little awkward to host this type of formatting logic in MP though, but we should definitely re-visit once we have more of these.

I'll go ahead and merge and cut a new TestFlight release.

[artsyit]

:rocket: PR was released in v1.20.0 :rocket: