Add python client name for Microsoft.Monitor (#42668)

Author: ChenxiJiang333

specification/monitoringservice/resource-manager/Microsoft.Monitor/Slis/client.tsp

@@ -12,3 +12,5 @@ namespace Microsoft.Monitor;
 // Shared models (EvaluationType, BaselineProperties, Signal, etc.) remain public
 // because they are also used by the public Slis interface.
 @@access(SloView.sliSignalPreview, Access.internal);
+
+@@clientName(Microsoft.Monitor, "MonitorSlisMgmtClient", "python");