update kind jobs and add presubmits / postsubmits

[BenTheElder]

• add a simple build postsubmit for kind
• add build and verify presubmits
• migrate existing CI jobs to use new repo
• add a testgrid dashboard tab under sig-testing

TODO: the docs for path_alias are wrong, will update in a follow-up

[BenTheElder]

/assign @krzyzacy

[krzyzacy]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, krzyzacy

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[k8s-ci-robot]

@BenTheElder: Updated the job-config configmap using the following files:

• key kind-postsubmits.yaml using file config/jobs/kubernetes-sigs/kind/kind-postsubmits.yaml
• key kind-presubmit.yaml using file config/jobs/kubernetes-sigs/kind/kind-presubmit.yaml
• key kind.yaml using file config/jobs/kubernetes-sigs/kind/kind.yaml

In response to this:

• add a simple build postsubmit for kind
• add build and verify presubmits
• migrate existing CI jobs to use new repo
• add a testgrid dashboard tab under sig-testing

TODO: the docs for path_alias are wrong, will update in a follow-up

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