update managed hsm sku enum to string

Author: neerja581

specification/keyvault/resource-manager/Microsoft.KeyVault/KeyVault/models.tsp

@@ -588,13 +588,23 @@ enum KeyVaultNameUnavailableReason {
 /**
  * SKU of the managed HSM Pool
  */
-#suppress "@azure-tools/typespec-azure-core/no-enum" "FIXME: Update justification, follow aka.ms/tsp/conversion-fix for details"
-enum ManagedHsmSkuName {
-  Standard_B1,
-  Custom_B32,
-  Custom_B6,
-  Custom_C42,
-  Custom_C10,
+union ManagedHsmSkuName {
+  string,
+
+  /** Standard_B1 SKU */
+  Standard_B1: "Standard_B1",
+
+  /** Custom_B32 SKU */
+  Custom_B32: "Custom_B32",
+
+  /** Custom_B6 SKU */
+  Custom_B6: "Custom_B6",
+
+  /** Custom_C42 SKU */
+  Custom_C42: "Custom_C42",
+
+  /** Custom_C10 SKU */
+  Custom_C10: "Custom_C10",
 }
 
 /**

specification/keyvault/resource-manager/Microsoft.KeyVault/KeyVault/preview/2026-03-01-preview/openapi.json

@@ -4654,7 +4654,34 @@
       ],
       "x-ms-enum": {
         "name": "ManagedHsmSkuName",
-        "modelAsString": false
+        "modelAsString": true,
+        "values": [
+          {
+            "name": "Standard_B1",
+            "value": "Standard_B1",
+            "description": "Standard_B1 SKU"
+          },
+          {
+            "name": "Custom_B32",
+            "value": "Custom_B32",
+            "description": "Custom_B32 SKU"
+          },
+          {
+            "name": "Custom_B6",
+            "value": "Custom_B6",
+            "description": "Custom_B6 SKU"
+          },
+          {
+            "name": "Custom_C42",
+            "value": "Custom_C42",
+            "description": "Custom_C42 SKU"
+          },
+          {
+            "name": "Custom_C10",
+            "value": "Custom_C10",
+            "description": "Custom_C10 SKU"
+          }
+        ]
       }
     },
     "ManagedHsmTrigger": {

specification/keyvault/resource-manager/Microsoft.KeyVault/KeyVault/stable/2025-05-01/openapi.json

@@ -4654,7 +4654,34 @@
       ],
       "x-ms-enum": {
         "name": "ManagedHsmSkuName",
-        "modelAsString": false
+        "modelAsString": true,
+        "values": [
+          {
+            "name": "Standard_B1",
+            "value": "Standard_B1",
+            "description": "Standard_B1 SKU"
+          },
+          {
+            "name": "Custom_B32",
+            "value": "Custom_B32",
+            "description": "Custom_B32 SKU"
+          },
+          {
+            "name": "Custom_B6",
+            "value": "Custom_B6",
+            "description": "Custom_B6 SKU"
+          },
+          {
+            "name": "Custom_C42",
+            "value": "Custom_C42",
+            "description": "Custom_C42 SKU"
+          },
+          {
+            "name": "Custom_C10",
+            "value": "Custom_C10",
+            "description": "Custom_C10 SKU"
+          }
+        ]
       }
     },
     "ManagedHsmTrigger": {

specification/keyvault/resource-manager/Microsoft.KeyVault/KeyVault/stable/2026-02-01/openapi.json

@@ -4654,7 +4654,34 @@
       ],
       "x-ms-enum": {
         "name": "ManagedHsmSkuName",
-        "modelAsString": false
+        "modelAsString": true,
+        "values": [
+          {
+            "name": "Standard_B1",
+            "value": "Standard_B1",
+            "description": "Standard_B1 SKU"
+          },
+          {
+            "name": "Custom_B32",
+            "value": "Custom_B32",
+            "description": "Custom_B32 SKU"
+          },
+          {
+            "name": "Custom_B6",
+            "value": "Custom_B6",
+            "description": "Custom_B6 SKU"
+          },
+          {
+            "name": "Custom_C42",
+            "value": "Custom_C42",
+            "description": "Custom_C42 SKU"
+          },
+          {
+            "name": "Custom_C10",
+            "value": "Custom_C10",
+            "description": "Custom_C10 SKU"
+          }
+        ]
       }
     },
     "ManagedHsmTrigger": {