Add tutorial for AWS account setup with CloudFormation

[HCloward]

This file contains a tutorial for adding an AWS account using CloudFormation in Grafana Cloud. It includes steps for navigating the interface, creating a CloudFormation stack, and entering account details.

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Note

Low Risk
Adds a new tutorial content JSON only; no code paths, auth logic, or runtime behavior are modified.

Overview
Adds a new cpo11y-aws-account-cloudformation/content.json tutorial that walks users through connecting their first AWS account to Cloud Provider Observability using CloudFormation.

The guided steps cover in-product navigation to AWS Accounts, launching the CloudFormation stack, and completing account creation by entering the role ARN and selecting regions, plus brief “why this matters” context and next steps.

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