📖 Moving CNI troubleshooting section from KubeVirt tab

[dmvolod]

What this PR does / why we need it:
Calico CNI troubleshooting section is related to all providers, except vcluster, but was hidden inside the KubeVirt tab which is not clear for users, who implementing Quick Start. This PR moving this section outside the KubeVirt to the common document part inside the Deploy a CNI solution section.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[k8s-ci-robot]

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[dmvolod]

/area documentation