Parallel creation of multiple loadbalancers

[mdbooth]

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/kind feature

Describe the solution you'd like LoadBalancers take many minutes to become available after creation. We currently wait synchronously for a loadbalancer to become available immediately after creation: https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/63b8bcf1b3860347d6f860a3dd5bd582d1899a95/pkg/cloud/services/elb/loadbalancer.go#L128-L133

This is inefficient when creating more than one ControlPlaneLoadBalancer, for example when creating both the internal and external LBs of an OpenShift cluster. Ideally we would create all loadbalancers first, then wait for them to become ready.

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

Environment:

• Cluster-api-provider-aws version: v2.8.1-129-g63b8bcf1b (main)

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