Checklist for new fields - a11y

[sample data](https://docs.google.com/spreadsheets/d/1EYKdL3uRy3poAbxrjIwb4W_szX3M7i-_tT3lXF1mnYY/edit#gid=85707205)

* [x] Confirm field ID
* [x] Confirm data type and nature
* [x] Confirm location in the CSV
* [x] Give search.gov team a heads up if order of final_url_live and target_url_redirects would change.'
* [ ] Review data to make sure it aligns with existing public data ([this](https://docs.google.com/spreadsheets/d/1EYKdL3uRy3poAbxrjIwb4W_szX3M7i-_tT3lXF1mnYY/edit#gid=85707205) vs. [this](https://docs.google.com/spreadsheets/u/2/d/1TnhgpnpSkyYXZrwmD7jdVKqKXG7wS9HkCtj8gVB18UY/edit?usp=drive_web&ouid=106023986186241566265))
* [ ] Update the [data dictionary](https://github.com/GSA/site-scanning-documentation/blob/main/data/Site_Scanning_Data_Dictionary.csv)
* [ ] Add the fields to https://github.com/GSA/site-scanning/issues/376
* [ ] Update [this table](https://digital.gov/guides/site-scanning/understand-the-data/)
* [ ] Greenlight @akuny updating the API and snapshots
* [ ] Update itdb team & co.

Start by comparing the two linked spreadsheets, then review the data dictionary in site-scanning-documentation and the related work in issue #376. Complete the remaining checklist items: reconcile the data, update the dictionary and public table, coordinate API and snapshot changes, and notify the listed teams.

Written by the indexing model from the issue text.