GN-105: Communicate new GN-105 requirements to engineering

Created by: taylorsperry

We need to communicate to every engineer that new requirements are in place and provide instruction for how to meet them.

A possible supplement to this (if not a solution in itself) would be to add a PR template that prompts engineers to acknowledge that the code they're merging meets requirements. This could be a simple checkbox that asserts something like "This code has been tested and peer-reviewed."

Definition of Done: Once the SOC2: Application Testing Approach document has been approved by the DevX team, the Security team, and leadership, share the document in Slack and add it to the handbook.