fix: Update CKV_AZURE_171 to check automatic_upgrade_channel

[paddymorgan84]

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Fixes #6681

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• I have performed a self-review of my own code
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• I have added tests that prove my feature, policy, or fix is effective and works
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Dear maintainer, below is a concise technical summary of the changes proposed in this PR:

Update the AKSUpgradeChannel class to correct the key from automatic_channel_upgrade to automatic_upgrade_channel. This change ensures the policy check aligns with the correct Azure resource property. Adjust the test cases in example_AKSUpgradeChannel/main.tf to reflect this key change, ensuring both passing and failing scenarios are accurately tested.

Topic	Details
Test Update	Update test cases to reflect the corrected key in example_AKSUpgradeChannel. Modified files (1) tests/terraform/checks/resource/azure/example_AKSUpgradeChannel/main.tf Latest Contributors(1) Email Commit Date james.woolfenden@gmail... feat-terraform-new-azu... December 28, 2022
Key Correction	Correct the key in AKSUpgradeChannel to ensure accurate policy checks. Modified files (1) checkov/terraform/checks/resource/azure/AKSUpgradeChannel.py Latest Contributors(1) Email Commit Date james.woolfenden@gmail... feat-terraform-new-aks... December 06, 2022

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[paddymorgan84]

Fixes #6681