[2.9] Update Azure Availability Zone Region List

[nwmac]

The list of available AKS regions is not hardcoded, but whether or not they support availability zones (enforced in the UI through form validation) is hardcoded here: https://github.com/rancher/dashboard/blob/master/pkg/aks/util/aks.ts#L7. We need to update this list to include southcentralus and any other regions missing from https://learn.microsoft.com/en-us/azure/reliability/availability-zones-service-support#azure-regions-with-availability-zone-support

Ensure we check and add all missing regions.

[gaktive]

For QA's attention, this may have to be tested before what should be 2.9.2/2.9.next1. cc @rancher-max

[IsaSih]

From the regions with availability zones support mentioned in https://learn.microsoft.com/en-us/azure/reliability/availability-zones-service-support#azure-regions-with-availability-zone-support, these are not being listed in the UI:
US Gov Virginia - I believe it is because the credentials used for testing belong to the public cloud environment, not the Azure US Government Cloud
Japan West - which is marked with a star in the Microsoft docs and listed in our UI as a region with no support for Availability Zones
China North 3 - I believe it is because the credentials used for testing belong to the public cloud environment, not the Azure China Cloud
New Zealand North - Is not listed at all as a region in our UI, but as it comes from an API call, I'll consider it as passed

[IsaSih]

provisioned AKS cluster in region South Central US in 3 availability zones. Found non-blocker related-issue #11841. The scope of this issue is working as expected.