Enable granularity for which controllers to run

[enxebre]

/kind feature

Describe the solution you'd like
As a cluster service provider managing a multi-tenant environment I would like to setup my capi controllers to watch only well known targeted resources and do not run unnecessary controllers. E.g If I'm targeting aro/aks clusters I don't need to run the AzureMachine or the AzureCluster controllers or if I'm using AzureMachine with externally managed infra I don't need ASOAPI

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):

[damdo]

/cc @nojnhuh @mboersma @jackfrancis

[bryan-cox]

This helps some with this - #5099