tsp config api-version preview (#44282)

Author: audunn

specification/netapp/resource-manager/Microsoft.NetApp/NetApp/tspconfig.yaml

@@ -20,7 +20,7 @@ options:
     generate-test: true
     generate-sample: true
     flavor: "azure"
-    api-version: "2026-04-01"
+    api-version: "2026-04-15-preview"
   "@azure-tools/typespec-java":
     emitter-output-dir: "{output-dir}/{service-dir}/azure-resourcemanager-netapp"
     namespace: "com.azure.resourcemanager.netapp"
@@ -29,15 +29,15 @@ options:
     float32-as-double: false
     client-side-validations: true
     uuid-as-string: false
-    api-version: "2026-04-01"
+    api-version: "2026-04-15-preview"
   "@azure-tools/typespec-ts":
     emitter-output-dir: "{output-dir}/{service-dir}/arm-netapp"
     flavor: azure
     experimental-extensible-enums: true
     ignore-nullable-on-optional: false
     package-details:
       name: "@azure/arm-netapp"
-    api-version: "2026-04-01"
+    api-version: "2026-04-15-preview"
   "@azure-typespec/http-client-csharp-mgmt":
     namespace: "Azure.ResourceManager.NetApp"
     emitter-output-dir: "{output-dir}/{service-dir}/{namespace}"
@@ -52,7 +52,7 @@ options:
     generate-fakes: true
     head-as-boolean: true
     inject-spans: true
-    api-version: "2026-04-01"
+    api-version: "2026-04-15-preview"
 
 linter:
   extends: