[powerbidedicated] Add python client name customization (#44437)

Set the Python SDK client name to PowerBIDedicatedMgmtClient via @@clientName
python override for the Microsoft.PowerBIDedicated TypeSpec.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: msyyc

specification/powerbidedicated/resource-manager/Microsoft.PowerBIdedicated/PowerBIDedicated/client.tsp

@@ -6,6 +6,12 @@ using Azure.Core;
 using Azure.ResourceManager.Foundations;
 using Microsoft.PowerBIDedicated;
 
+@@clientName(
+  Microsoft.PowerBIDedicated,
+  "PowerBIDedicatedMgmtClient",
+  "python"
+);
+
 @@clientName(Capacities.getDetails, "get", "csharp");
 @@clientName(
   CheckCapacityNameAvailabilityParameters,