[ACR] az acr scope-map delete: Fix missing service warnings

[SakoPak (SakoPak)]

Related command
az acr scope-map delete

Description
When a scope map deletion completes with a service warning, Azure CLI currently exposes the x-ms-warning response header only in debug logs. Users running az acr scope-map delete normally do not see which associated tokens require follow-up action.

This PR registers an Azure SDK response hook for the asynchronous delete operation and emits each distinct service warning once through the standard CLI warning channel. Behavior remains unchanged when the service does not return x-ms-warning.

This change works in tandem with the active ACR backend implementation:
https://msazure.visualstudio.com/One/_git/DevServices-ContainerRegistry-Service/pullrequest/16790540

Repair item:
https://msazure.visualstudio.com/AzureContainerRegistry/_workitems/edit/33216671

Testing Guide

1. Run the ACR mock command tests: python -m unittest azure.cli.command_modules.acr.tests.latest.test_acr_commands_mock.AcrMockCommandsTests.
2. Verify a response without x-ms-warning does not emit a warning.
3. Verify repeated polling responses containing the same x-ms-warning emit the warning once.
4. After backend PR 16790540 is deployed, delete a scope map associated with a token missing its authorization entity and verify the token-specific warning is displayed without --debug.

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[Yong Zhang (yonzhan)]

ACR

[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation is focused, correctly handles LRO responses, and includes appropriate regression coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Adds user-visible, deduplicated service warnings for az acr scope-map delete.

Changes:

• Adds an SDK response hook for x-ms-warning.
• Emits each distinct warning once.
• Adds focused tests for absent and repeated warnings.

File	Description
acr/​_utils.py	Adds the warning response hook.
acr/​scope_map.py	Attaches the hook to scope-map deletion.
acr/​tests/​latest/​test_acr_commands_mock.py	Tests hook registration and deduplication.

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