fix: correct fieldsets on public site

[emilyjablonski]

This PR addresses parts of related issues like #2240 #2241

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

For our public site forms:

• Related fields should be wrapped in a fieldset (like first / middle / last name, or addresses).
• Fieldsets need to have legends (we had some missing altogether or were using labels).

Highly recommend reviewing with the hide whitespace toggle enabled! In Voiceover, fieldsets will be read when entering the category of fields, and announced on exit.

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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[YazeedLoonat]

LGTM