Support AKS cluster with HTTP Proxy mode

[mjnovice]

⚠️ Cluster API Azure maintainers can ask to turn an issue-proposal into a CAEP when necessary. This is to be expected for large changes that impact multiple components, breaking changes, or new large features.

Goals

1. Ability to create AKS clusters with http_proxy support https://learn.microsoft.com/en-us/azure/aks/http-proxy

Non-Goals/Future Work

1. Non-Goal 1
2. Non-Goal 2

User Story

As a [developer/user/operator] I would like to be able to create a Azure managed Cluster ( with AzureManagedControlPlane/AzureManagedMachinePool ) using the HTTP_PROXY mode.

Detailed Description

AzureManagedControlPlane can have a field httpProxyConfig akin to

allowing us to create the cluster with proxy mode.

/kind proposal

[nojnhuh]

Looks good, thanks! I think this is small enough that we can classify this as a regular feature request instead of a proposal. No need to change the description though.

/remove-kind proposal
/kind feature

[mjnovice]

@nojnhuh I would be willing to work on this, just curious, can we go with making changes with autorest client for now, or do we have a guidance for new features ? Any help would be great

[nojnhuh]

I don't think adding this feature will require any new use of autorest so I think following the existing pattern is a good place to start. If you run into any specific cases feel free to ask then or we can address those once you have a PR open.

Thanks for picking this up!

/assign @mjnovice