[containerservicepreparedimgspec] Add python client name

[ChenxiJiang333]

update python tsp config to release sdk: Azure/azure-sdk-for-python#48104
namespace review: Azure/azure-sdk#10095

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[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
TypeSpec	Microsoft.ContainerService
Go	sdk/resourcemanager/containerservicepreparedimgspec/armcontainerservicepreparedimgspec
Python	azure-mgmt-containerservicepreparedimgspec
C#	Azure.ResourceManager.ContainerServicePreparedImgSpec
JavaScript	@azure/arm-containerservicepreparedimgspec

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[ChenxiJiang333]

Hi @palma21 @matthchr, this pr only changes python sdk behavior, could you help give an approval?