Refactor integration tests to use `lightkube` rather than `kubectl` commands

[NohaIhab]

Context

In the integration tests of argo-controller, we are directly using kubectl commands and using ops_test.run to run them. This can be improved by using lightkube APIs rather.

What needs to get done

Rewrite the following functions in integration tests to use lightkube instead of kubectl commands:

• create_artifact_bucket
• submit_workflow_using_artifact
• submit_workflow_using_artifact

Definition of Done

kubectl CLI commands are no longer being used in the integration tests of argo-controller

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-7183.

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