AKS - fix container monitoring checkbox

[mantis-toboggan-md]

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Summary

Fixes #10965

Occurred changes and/or fixed issues

The 'container monitoring' checkbox should correspond to aksConfig.monitoring - previously it was just gating the visibility of the two log analytics inputs. This PR corrects that and adds a few unit tests.

Areas or cases that should be tested

1. create an AKS cluster with container monitoring enabled, and log analytics workspace name/group set - the payload should include aksConfig.monitoring = true
2. edit cluster and disable container monitoring - the payload should include aksConfig.monitoring = false, and aksConfig.logAnalyticsWorkspaceName and aksConfig.logAnalyticsWorkspaceGroup set to null

Checklist

• [x] The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
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• [x] The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
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