Added kubernetes logo to illustrations

Emily Ringrequested to merge
kubernetes-logo into master

Added kubernetes logo to illustrations/logos/kubernetes.svg

This is part of the cluster page redesign.

Epic: &2666 (closed)

Issue: gitlab#208223 (closed)

We will display a default kubernetes logo when a provider (Google, AWS, etc) is not found.

This new logo will be the logo that appears on the clusters page.

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