Document how to use a pre-existing ASO with CAPZ

[nojnhuh]

/kind documentation

Describe the solution you'd like
Currently, ASO is always and unconditionally installed alongside CAPZ to enable smooth adoption for clusterctl init users. CAPZ doesn't require any special configuration of ASO though, so if a user has ASO already installed, CAPZ should be able to use that one instead of relying on always installing a new ASO.

I think this is already possible today, though it involves a lot of manual steps. Off the top of my head they would include:

• Installing a customized version of the infrastructure-components.yaml from a CAPZ release with the ASO components removed
• Ensuring all the ASO CRDs required by CAPZ are installed
• Labeling the ASO CRDs required by CAPZ with clusterctl.cluster.x-k8s.io for clusterctl move to also move the ASO resources

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

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

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[nojnhuh]

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