2142647 Update AKS API used to get cluster credentials in AKS tasks

[PhilipsonJoseph]

Task name: AzureFunctionOnKubernetesV1 HelmDeployV0 HelmDeployV1 KubernetesManifestV1 KubernetesV1

Description: New API for fetching credentials are added based on the FF

Documentation changes required: (Y/N) N

Added unit tests: (Y/N) N

Attached related issue: (Y/N) Y

Checklist:

• [X] Task version was bumped - please check instruction how to do it
• [X] Checked that applied changes work as expected

https://dev.azure.com/mseng/AzureDevOps/_workitems/edit/2073393

[PhilipsonJoseph]

azp /run

[PhilipsonJoseph]

/azp run

[azure-pipelines[bot]]

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