fix(arcdata): incorrect .net sdk path (#16008)

Current .net SDK path for arcdata points to
https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/resources which
is for `Resources`.
This commit will change the path to
https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/azurearcdata

Author: archerzz

specification/azurearcdata/resource-manager/readme.csharp.md

@@ -11,5 +11,5 @@ csharp:
   clear-output-folder: true
   client-side-validation: false
   namespace:  Microsoft.Azure.Management.AzureArcData
-  output-folder: $(csharp-sdks-folder)/resources/Microsoft.Azure.Management.AzureArcData/src/Generated
+  output-folder: $(csharp-sdks-folder)/azurearcdata/Microsoft.Azure.Management.AzureArcData/src/Generated
 ```