Add OIDCIssuerProfile configuration option

[nijave]

/kind feature

Describe the solution you'd like
In order to enable Azure Workload Identity, the OIDC issuer needs to be enabled on new clusters. Add a field AzureManagedControlPlane for enabling OIDC issuer.

Anything else you would like to add:
Basically just a configuration option that does the same as this cli command https://docs.microsoft.com/en-us/azure/aks/cluster-configuration#update-an-aks-cluster-with-oidc-issuer

Environment:

• cluster-api-provider-azure version: v1.4.0
• Kubernetes version: (use kubectl version): v1.22
• OS (e.g. from /etc/os-release):

[CecileRobertMichon]

/help

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[CecileRobertMichon]

/area managedclusters

[nojnhuh]

/assign

[nojnhuh]

Since we haven't added any AKS preview features yet to CAPZ, there's some work we need to do yet to determine how those should be implemented generally which is being tracked in #2625. Once that's done, this looks like it would be a great first preview feature to implement!

/unassign

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/lifecycle stale

[nijave]

/remove-lifecycle stale

[mjnovice]

+1 for this feature.

[andreipantelimon]

Workload Identity is now Merged in CAPZ and GA in Azure and since AAD Pod Identity is getting deprecated, this feature is mandatory. Is there a guide on how to enable this?

[CecileRobertMichon]

@mboersma @nojnhuh this is one where we need either ASO (#3529) or SDK v2 (#3409) to be able to unblock it

[maciaszczykm]

I'd really love to have it. Do you have any estimate on when it should be ready? Even on main branch.

[nojnhuh]

/assign