035-workspaces-personal: requires AD directory user for non-interactive testing

[mwunderl]

Problem

The WorkSpaces tutorial requires a user to exist in the Active Directory before creating a WorkSpace. Simple AD user creation needs LDAP tools or a domain-joined EC2 instance.

Current state

• Simple AD directory deployed via 000-prereqs-directory CFN stack
• Directory registered with WorkSpaces
• Script finds the directory but fails because the auto-generated username doesn't exist in AD

Steps to resolve

1. Launch a domain-joined EC2 instance in the directory's VPC
2. Use AD tools to create a test user
3. Or: modify the script to use the WorkSpaces API to create a user (if supported)
4. Test the script end-to-end
5. Add back to the non-interactive PR