[ACR] Support ARM scoped token in ACR for Azure Local Disconnected Operations

[RohanPawarMSFT]

Related command

az acr login

Description

Azure Local Disconnected Operations (ALDO) does not use AAD scoped tokens for token exchange and rely on ARM scoped tokens to acquire ACR token.

Testing Guide
az acr login --debug

History Notes
[ACR] az acr login: Support fallback for ARM scoped tokens for token exchange

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[Copilot]

Pull request overview

This PR updates the ACR (az acr login) token acquisition flow to support Azure Local Disconnected Operations (ALDO) environments where the ACR audience resource may not be registered, by attempting an ARM-scoped token fallback for the ACR token exchange.

Changes:

• Added _acquire_aad_token_for_acr_exchange to first request an ACR-audience token and fall back to the cloud’s ARM resource when the ACR resource is not recognized.
• Updated _get_aad_token_after_challenge to use the new helper for token acquisition.

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[Copilot]

The fallback logic won’t trigger for the common “invalid resource/scope” case because Profile.get_raw_token() ultimately raises azure.cli.core.azclierror.AuthenticationError via auth.util.check_result(), not knack.util.CLIError. As a result, ALDO/disconnected clouds will still fail instead of falling back to the ARM resource. Catch AuthenticationError (and/or the broader Azure CLI error base) here, and then apply the same unknown_resource_markers check before retrying with active_directory_resource_id.

[RohanPawarMSFT]

@copilot apply changes based on this feedback

[Copilot]

This new AAD→ARM fallback behavior is not covered by the existing mocked token-flow tests in test_acr_commands_mock.py (they only assert the happy-path get_raw_token call). Please add a unit test that simulates Profile.get_raw_token() failing with an invalid-resource AuthenticationError (e.g., AADSTS500011/invalid_resource) and asserts the second call uses cli_ctx.cloud.endpoints.active_directory_resource_id and the warning path is exercised.

[RohanPawarMSFT]

@copilot apply changes based on this feedback