Add AKS Automatic flavor template

[nojnhuh]

/kind feature

Describe the solution you'd like

Since AKS Automatic is being billed as the AKS "easy button" we should have a flavor template that users can build off of that shows how to get that up and running in CAPZ.

We should also include an e2e test that deploys a similar template.

Anything else you would like to add:

Environment:

• cluster-api-provider-azure version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[nojnhuh]

This is currently blocked on #5017.