clean up old 1.8 federation jobs

[krzyzacy]

/area jobs
/assign @amwat @cjwagner @BenTheElder
cc @shashidharatd @madhusudancs fyi, retiring old 1.8 federation jobs

[amwat]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[k8s-ci-robot]

@krzyzacy: Updated the config configmap using the following files:

• key config.yaml using file prow/config.yaml

In response to this:

/area jobs
/assign @amwat @cjwagner @BenTheElder
cc @shashidharatd @madhusudancs fyi, retiring old 1.8 federation jobs

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