The addition `_utils` folder has disrupted the processing logic of Azure CLI build script

[zhoxing-ms]

• Package Name:
  azure-mgmt-containerregistry
• Package Version:
  14.0.0
• Operating System:
  ALL
• Python Version:
  ALL

Describe the bug
Currently, _utils exists in both the root folder of the mgmt SDK and also API-specific folders in the new Python SDK (like azure-mgmt-containerregistry==14.0.0) :

breaking of fact that each API-specific folder is separated and self-containing. At present, the CLI build script mistakenly imports _utils as an api-version folder then import a non-existent azure.mgmt.containerregistry._utils.models package , resulting in a ModuleNotFoundError: No module named 'azure.mgmt.containerregistry._utils.models' error
For more details, please refer to the PR comment Azure/azure-cli#31382 (comment)

Moreover, the serialization.py files in different _utils also contain duplicated code, these duplicate _utils folders and serialization.py code will also increase the package size, which is also our concern

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