AOSM CLI- Fix UnAuthorized Action with az aosm nsd publish

[nafizhaider32]

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Pull request overview

This PR updates the AOSM extension to fix unauthorized errors when publishing to Azure Container Registry (ACR) via az aosm nsd publish, and bumps the extension version accordingly.

Changes:

• Bump the AOSM extension version from 2.0.0b3 to 2.0.0b4 and document the new release in HISTORY.rst.
• Update AzureContainerRegistry.copy_image_to_target_acr to obtain an ACR-scoped access token and pass additional parameters into az acr import to address 401/Unauthorized issues.
• Introduce private helper methods for retrieving the current subscription ID and the source ACR’s resource group (not yet used in the main flow).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/aosm/setup.py	Bumps the extension version to 2.0.0b4 to match the new release containing the ACR authorization fix.
src/aosm/azext_aosm/common/registry.py	Adjusts the ACR import logic to use an ACR-specific OAuth scope and additional parameters, and adds helper methods for subscription and resource group lookup.
src/aosm/HISTORY.rst	Adds a 2.0.0b4 changelog entry describing the fix for unauthorized errors when publishing to ACR.

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