Hotfix combobox plus hidden field under date field

[plocket]

In this PR, I have:

• [x] Added tests for any new features or bug fixes (if relevant)
• [x] Added my changes to the CHANGELOG.md at the top, under the "Unreleased" section
• [x] (N/A) Ensured issues that this PR closes will be automatically closed

Reason for this PR

A user reported that setting a combobox field wasn't working. This ended up being multifactorial.

1. Because of DOM issues (new?), we weren't getting the variable name of the combobox fields.
2. There was a date field above the combobox. The combobox's hidden field was being filled in first, which triggered the date field to show its calendar popup. I believe the popup ate the input for the combobox.

Skipping hidden fields might be a problem when we get to the current random input implementation, but still feels like the right way to go. We should instead always avoid filling in hidden fields.

Also, I had to deactivate the test for a11y because of the reasons I brought up in its comments and in https://github.com/SuffolkLITLab/ALKiln/issues/744.

Links to any solved or related issues

N/A

Any manual testing I have done to ensure my PR is working

No. The manual tests did not surface the behavior.

[plocket]

We'll have to work out accessibility failures as one of the next items.