fix: improve resiliency for e2e tests by adding tweaking retries and timeouts (partially fixes #449)

[ritwikranjan]

Description

This pull request includes several changes to improve the reliability and efficiency of the Kubernetes end-to-end testing framework. The most important changes involve adjusting timeouts and retry mechanisms to enhance robustness and reduce wait times.

Improvements to retry mechanisms:

• test/e2e/framework/kubernetes/exec-pod.go: Added retry logic using retry.OnError for executing commands in a pod to handle transient errors more gracefully.
• test/e2e/framework/kubernetes/port-forward.go: Enabled exponential backoff in the default retrier to improve the efficiency of retry attempts.

Adjustments to timeouts and delays:

• test/e2e/framework/azure/create-cluster-with-npm.go: Increased the clusterTimeout from 10 to 15 minutes to allow more time for cluster creation.
• test/e2e/framework/kubernetes/port-forward.go: Reduced the defaultRetryDelay from 5 seconds to 500 milliseconds to decrease the wait time between retry attempts.

Dependency updates:

• test/e2e/framework/kubernetes/exec-pod.go: Added import for k8s.io/client-go/util/retry to support the new retry logic.

Please provide a brief description of the changes made in this pull request.

Related Issue

It fixes the issue #449 which talk about the intermittent failures in our e2e test.

Checklist

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• I have updated the documentation, if necessary.
• I have added tests, if applicable.

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