Feature: add company field persistence to next-gen form

[jonwaldstein]

Description

This adds persistence support for the company field on the next-gen donation form. Since there is currently no option to specify if the field is required right now in the form-builder, we'll assume it's optional until we add that functionality.

Affects

• The donation form
• Removed a couple unnecessary hidden fields as well

Testing Instructions

• Make sure GiveWP develop branch is up to date
• In next-gen run npm run dev
• Create a next-gen form with a company field
• Donate using that form and fill in company field
• Make sure that field is recorded within a donation record in the back-end

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Relevant @unreleased tags included in DocBlocks
• Includes unit tests
• Reviewed by the designer (if follows a design)
• Self Review of code and UX completed

[jonwaldstein]

@kjohnson this is ready for review.

[github-actions]

A build of this branch is available at https://impress-org.github.io/givewp-next-gen/feature/company-field-persistance

[kjohnson]

Looks good to me! I love small change sets 😎

[github-actions]

A build of this branch is available at https://impress-org.github.io/givewp-next-gen/develop