PRP-202: Finish /name

[makaelastephens]

Ticket

https://wicmtdp.atlassian.net/browse/PRP-202

Changes

• Fixed the error validation so the proper error message shows up
• Routes to /count
• Added e2e tests

Context for reviewers

• I DM'd with Sasha about this - I wasn't sure how to pass in the field IDs for the name fields, so I did a workaround...

Testing

[github-actions[bot]]

Chromatic_Build : Link to latest build in Chromatic 🌈 Link to storybook build in Chromatic