Formstack consents - AWS Java SDK update

We received an email from Huma Islam from Identity & trust regarding a required updated to AWS's Java SDK.

Link: https://groups.google.com/a/guardian.co.uk/g/newsletters.dev/c/cgGeU_CgocM/m/HTJ4yl-KBgAJ

They are trying to find out who owns https://github.com/guardian/identity-processes/tree/main/formstack-consents as they have **merged** in a PR in to update the AWS Java SDK version from 1 to 2, which could affect these.

This appears to have been branched off this original ticket https://github.com/guardian/maintaining-scala-projects/issues/9 for upgrading the AWS Java SDK on all guardian projects (because v1 is EOL).

We need to:

* Find out who owns https://github.com/guardian/identity-processes/tree/main/formstack-consents
* Understand more about the formstack consents, and where they are used.
* Find out what sort of call is made to IDAPI to signup. Authenticated ( click a link in email ) or not?

Update:

After a quick investigation, we can tell the formstack form is used at least here: https://holidays.theguardian.com/newsletter/ and perhaps elsewhere.

@dblatcher very helpfully provided a link to his original documentation regarding formstack forms: https://docs.google.com/document/d/1YE2B8AB93khYqLj7OdZgO1V9pmJcHqD6MYfB8hfCpxY/edit?tab=t.0#heading=h.o7ah5ol5ihdj

I've checked the production AWS Lambda function here: https://eu-west-1.console.aws.amazon.com/lambda/home?region=eu-west-1#/functions/FormstackConsentsLambda-PROD?tab=monitoring

There have been 3,151 invocations in the last 12 months, and no failures.