Update the aks-e version for pipeline validation.

[csfmomo]

Update aks-engine version for acn validation. New version is using the latest aks-engine release and remove duplicated and unnecessary npm tests. Remove unnecessary resource clean up step in pipeline since it's already included in the aks-e e2e test. Also update the Kubernetes version accordingly.
It can accelerate the pipeline validation for almost 1 hour.

https://dev.azure.com/msazure/One/_build/results?buildId=62165531&view=results

Reason for Change:

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests

Notes:

[vakalapa]

AKS-E npm validation scenarios

1. Applying a network policy to deny ingress access, then validate there is no ingress access anymore
2. Applying a network policy to deny egress access, then validate there is no egress access anymore
3. Applying a network policy to allow ingress to certain tag/label, then validate there is ingress access to that tag/label but no access to the pods that doesn't match
4. Applying a network policy to allow egress to certain tag/label, then validate there is egress access to that tag/label but no access to the pods that doesn't match
5. Applying a network policy to allow ingress to certain namespace, then validate there is ingress access to that namespace but no access to the pods namespace doesn't match

These tests are covered more extensively in cyclonus and conformance NPM pipelines