[Beta] Get SMS VPC Bootstrap CloudFormation Template

VPC support for Managed Scans is in private beta.

Returns the Managed Scans VPC Bootstrap CloudFormation template in JSON format for setting up cross-account infrastructure.

This template creates IAM roles and policies needed for Semgrep Managed Scanning (SMS) VPC infrastructure automation, including the semgrep-sms-vpc-automation role and EC2 Image Builder distribution roles for gVisor container runtime.

See the original AWS cloudformation template format at https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-formats.html