{AKS}: fix subscription id not correctly set in helm chart

[mainred]

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[Copilot]

Pull request overview

This pull request fixes a bug where the subscription ID field name in the helm chart values was incorrectly set. The field name is changed from subscriptionId to subscriptionID to match the expected helm chart schema.

• Corrected the subscription ID field name from "subscriptionId" to "subscriptionID" in the AKS context helm values
• Bumped the extension version from 1.0.0b12 to 1.0.0b13
• Updated the release history with the bug fix description

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/aks-agent/setup.py	Version bump from 1.0.0b12 to 1.0.0b13
src/aks-agent/azext_aks_agent/agent/k8s/aks_agent_manager.py	Fixed the subscription ID field name in helm values from "subscriptionId" to "subscriptionID"
src/aks-agent/HISTORY.rst	Added release notes for version 1.0.0b13 documenting the subscription ID fix

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[Release] Update index.json for extension [ aks-agent-1.0.0b13 ] : https://dev.azure.com/msazure/One/_build/results?buildId=146302359&view=results