Refactor "Airtable utils" code

[eddybrando]

Feature description

The code in our "/hooks" directory (in particular the Airtable related utils) could benefit from a clean up and DRYing.

For instance, we can analyse if the "get*" methods could be replaced by JavaScript class getters, we could reevaluate the need for some of the tests cases that we currently have and maybe abstract some more reusable code.

Additional context

The issue was initially raised by @y4izus in #2926 (comment) but we decided to move it to it's own GitHub issue to avoid extending the scope of that pull request.