[Az.DesktopVirtualization] Rename ResourceDisk to TempDisk for SHC, in 2026-04-01-preview (#44383)

* Rename the ResourceDisk to TempDisk for SHC

* Cleanup the ResourceDisk

---------

Co-authored-by: Zhongjie Li <zhongjieli@microsoft.com>

Author: Fat-Salty-fish

specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/DesktopVirtualization/models.tsp

@@ -1244,7 +1244,7 @@ union DiffDiskOption {
 }
 
 /**
- * Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise ResourceDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'ResourceDisk'.
+ * Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise TempDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'TempDisk'.
  */
 union DiffDiskPlacement {
   string,
@@ -1255,9 +1255,9 @@ union DiffDiskPlacement {
   CacheDisk: "CacheDisk",
 
   /**
-   * Resource disk placement
+   * Temp disk placement
    */
-  ResourceDisk: "ResourceDisk",
+  TempDisk: "TempDisk",
 }
 
 /**
@@ -1741,7 +1741,7 @@ model DiffDiskProperties {
   option?: DiffDiskOption;
 
   /**
-   * Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise ResourceDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'ResourceDisk'.
+   * Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise TempDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'TempDisk'.
    */
   placement?: DiffDiskPlacement;
 }

specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/DesktopVirtualization/preview/2026-04-01-preview/desktopvirtualization.json

@@ -7348,10 +7348,10 @@
     },
     "DiffDiskPlacement": {
       "type": "string",
-      "description": "Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise ResourceDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'ResourceDisk'.",
+      "description": "Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise TempDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'TempDisk'.",
       "enum": [
         "CacheDisk",
-        "ResourceDisk"
+        "TempDisk"
       ],
       "x-ms-enum": {
         "name": "DiffDiskPlacement",
@@ -7363,9 +7363,9 @@
             "description": "Cache disk placement"
           },
           {
-            "name": "ResourceDisk",
-            "value": "ResourceDisk",
-            "description": "Resource disk placement"
+            "name": "TempDisk",
+            "value": "TempDisk",
+            "description": "Temp disk placement"
           }
         ]
       }
@@ -7380,7 +7380,7 @@
         },
         "placement": {
           "$ref": "#/definitions/DiffDiskPlacement",
-          "description": "Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise ResourceDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'ResourceDisk'."
+          "description": "Gets or sets specifies the ephemeral disk placement for operating system disk. The defaulting behavior is: CacheDisk if one is configured for the VM size otherwise TempDisk is used. Refer to the VM size documentation for Windows VM at https://docs.microsoft.com/azure/virtual-machines/windows/sizes and Linux VM at https://docs.microsoft.com/azure/virtual-machines/linux/sizes to check which VM sizes exposes a cache disk. Possible values include: 'CacheDisk', 'TempDisk'."
         }
       }
     },