API does not throw error while adding nodepool with AZ

[cpinjani]

Setup
Rancher version: v2.10-c4944b3ca0b39c474121df9e7ef31f7aff4e4f7a-head
AKS Operator version: v1.10.1-rc.2

Description
Via UI, it is not possible to add nodepool with Availability Zone for a cluster created in region with no support for AZ. Updating this via API does not raise any error. It simply reverts the changes to AKSConfig after a few minutes.
The API should raise an error for the same.

Steps to reproduce:

• Create a cluster in region without AZ support Eg. WestUS
• Add nodepool via API and mention availability zones

Expected results:
The API must throw an error while adding nodepool with AZ in region where AZ are not supported.

Logs

time="2024-12-12T08:17:17Z" level=info msg="Checking configuration for cluster [cpinjani-akswest (id: c-4zdpb)]"
time="2024-12-12T08:17:18Z" level=info msg="Adding node pool [pool11] for cluster [cpinjani-akswest (id: c-4zdpb)]"
time="2024-12-12T08:17:24Z" level=info msg="Waiting for cluster [cpinjani-akswest (id: c-4zdpb)] to update node pool [pool11]"
time="2024-12-12T08:17:55Z" level=info msg="Checking configuration for cluster [cpinjani-akswest (id: c-4zdpb)]"
time="2024-12-12T08:17:56Z" level=info msg="Cluster [cpinjani-akswest (id: c-4zdpb)] finished updating"
time="2024-12-12T08:17:57Z" level=info msg="Checking configuration for cluster [cpinjani-akswest (id: c-4zdpb)]"
time="2024-12-12T08:17:59Z" level=info msg="Configuration for cluster [cpinjani-akswest (id: c-4zdpb)] was verified"

PR's:

• [v2.10] Add new AKS func listRegions for proxy UI rancher#48672
• Add new AKS func listRegions for proxy UI rancher#48716
• Check support for avaialibilty zones in region #836
• Check support for avaialibilty zones in region #830

[cpinjani]

Test Result
Rancher version: v2.11-1d345932e5f78b3da07ebe13691c8224c62b6240-head, AKS Operator version: v1.11.0-rc.3

Issue is reproducible on above build. Also the full validation is blocked by follow-up issue #850

cc: @mjura @mitulshah-suse

[rishabhmsra]

Validated on rancher v2.11-head:

• Created AKS v1.32 cluster in WestUS region.
• Once cluster came into Active state, added a node pool mentioning the availability zones via API.
• Cluster goes into Updating state with following error on UI : Failed to update cluster [rishabh-aks3 (id: c-zv2vj)]: availability zones are not supported in region westus
• Since we getting error after sending request via API, closing this issue.