Description of problem:

Creating ROSANetwork with setting the availability zones cause below error , also setting 3 availabilityZones however the availabilityZoneCount is 1

```
I1020 19:56:02.922678 1 rosanetwork_controller.go:129] "Reconciling ROSANetwork" controller="rosanetwork" controllerGroup="infrastructure.cluster.x-k8s.io" controllerKind="ROSANetwork" ROSANetwork="ns-rosa-hcp/rosa-net" namespace="ns-rosa-hcp" name="rosa-net" reconcileID="ab2c4d4d-43f0-425f-8f77-c93a4de616dc"
E1020 19:56:03.123266 1 controller.go:347] "Reconciler error" err="failed to start CF stack creation: operation error CloudFormation: CreateStack, https response error StatusCode: 400, RequestID: 86dc9f2b-5351-45b6-93ad-694a56d8a453, api error ValidationError: Parameters: [AZ0] do not exist in the template" controller="rosanetwork" controllerGroup="infrastructure.cluster.x-k8s.io" controllerKind="ROSANetwork" ROSANetwork="ns-rosa-hcp/rosa-net" namespace="ns-rosa-hcp" name="rosa-net" reconcileID="ab2c4d4d-43f0-425f-8f77-c93a4de616dc"
```

Version-Release number of selected component (if applicable):

MCE v2.10

How reproducible:

100%

Steps to Reproduce:

1- Create ROSANetwork using below CR example;
```
apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
kind: ROSANetwork
metadata:
finalizers:

• rosanetwork.infrastructure.cluster.x-k8s.io
  name: rosa-net
  namespace: ns-rosa-hcp
  spec:
  availabilityZoneCount: 1
  availabilityZones:
• us-west-2b
• us-west-2a
• us-west-2d
  cidrBlock: 10.0.0.0/16
  identityRef:
  kind: AWSClusterControllerIdentity
  name: default
  region: us-west-2
  stackName: rosa-hcp-vpc
  status:
  conditions:
• lastTransitionTime: "2025-10-20T19:55:28Z"
  message: 'operation error CloudFormation: CreateStack, https response error StatusCode:
  400, RequestID: 982fcbb8-3615-4c6e-9f25-b1189771c818, api error ValidationError:
  Parameters: [AZ0] do not exist in the template'
  reason: Failed
  severity: Error
  status: "False"
  type: ROSANetworkReady
  ```

Actual results:

Expected results:

Additional info: