Epic: Use az capi to create kubernetes clusters for testing

[CecileRobertMichon]

TODOs:

• pivot mgmt cluster to workload (by default?) #85
• pass in URI/file to workload template #98
• Update templates from v1alpha3 to v1beta1 #49
• default to Azure management cluster vs. local management cluster
• CNI / addons via ClusterResourceSet (+ turn on feature flag by default)
• provide a convenience for configuring the node OS (either allow passing in script to run on worker/control plane nodes or some easy way to apply a Daemonset on the workload cluster) Add pre/post bootstrap commands support #97
• de-duplicate template composition, improve composition of templates (individual CRDs) in CAPZ so we can rely on those fully

[CecileRobertMichon]

CNI / addons via ClusterResourceSet (+ turn on feature flag by default)

@mboersma looks like this is already done?

[mboersma]

We do install CNI from the Calico addons template in the CAPZ repo, but it doesn't involve ClusterResourceSet, just kubectl apply of that manifest. So I was assuming there is more work to do here...

[CecileRobertMichon]

Got it, it does seem like we are setting the feature flag though: https://github.com/Azure/azure-capi-cli-extension/blob/main/src/capi/azext_capi/custom.py#L109

[mboersma]

I'm going to close this epic as @DannyBrito has implemented basically everything here.