add: S3 Files

### Outline the high level topic of the lab

Add S3 Files to the workshop

### Provide the flow of the lab exercise, including what sample application components will be used

Flows the same as EFS workshop, since it also uses the EFS driver. Adds provisioning for S3 bucket to be used with S3 Files.

### What additional AWS infrastructure or EKS addons/components will need to be created or installed to support this lab?

Requires a [bump of AWS Terraform module](https://github.com/aws-samples/eks-workshop-v2/issues/1910) from 6.31.0 to 6.40.0 to support S3 Files, adds S3 bucket and S3 Files filesystem

### What additional software or configuration will be required in the Cloud9 IDE?

None

### Are enhancements to the retail sample application required to support this lab exercise?

None

Start by reviewing the existing EFS workshop flow and the Terraform module bump tracked in issue 1910. Add the S3 Files workshop with provisioning for an S3 bucket and S3 Files filesystem, keeping the EFS-based flow and sample application unchanged. Done means the lab is documented and its required AWS infrastructure is defined.

Written by the indexing model from the issue text.