feat(acr): surface x-ms-warning header on PE connection delete

[yushuliang0214]

Description

When a private endpoint connection delete returns 204 (resource not found), the ACR server now sends an x-ms-warning response header. This change reads that header from the initial LRO response and displays it to the user via logger.warning().

Changes

• src/azure-cli/azure/cli/command_modules/acr/private_endpoint_connection.py: Read x-ms-warning header from the delete LRO initial response and display it to the CLI user.

Testing

Tested with az acr private-endpoint-connection delete -r myRegistry -n nonExistentPE — warning message from server is displayed when PE does not exist (204 response).

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Pull request overview

This PR updates the ACR command module to surface server-side warnings returned via the x-ms-warning response header when deleting an ACR private endpoint connection (notably on 204 responses).

Changes:

• Adds a module logger to private_endpoint_connection.py.
• Reads the x-ms-warning header from the initial delete LRO response and emits it via logger.warning().

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[yonzhan]

acr

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