adds kfctl_k8s_istio config as a pre-submit test

[swiftdiaries]

Adds the default config - kfctl_k8s_istio.yaml part of the pre-submit tests.
/cc @kkasravi

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This change is 

[k8s-ci-robot]

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[krishnadurai]

/cc @krishnadurai

[kkasravi]

/retest

[jlewi]

@swiftdiaries is this ready for review?

[swiftdiaries]

I need to pull in changes. Let me do that now

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[googlebot]

CLAs look good, thanks!

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[k8s-ci-robot]

@swiftdiaries: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
kubeflow-kfctl-presubmit	20e2c0e	link	/test kubeflow-kfctl-presubmit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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