github, labels: move testing to category area

[dhiller]

What this PR does / why we need it:

Renames the label topic/testing to area/testing.

Note: after merge it will take a while for the labels to consolidate, since the jobs runs only once every day.

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 #

Special notes for your reviewer:

/cc @vladikr @brianmcarey

[vladikr]

/approve
Thank you @dhiller!

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vladikr

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[brianmcarey]

/lgtm

thanks @dhiller !

[kubevirt-bot]

@dhiller: Updated the label-config configmap in namespace kubevirt-prow at cluster default using the following files:

• key labels.yaml using file github/ci/prow-deploy/kustom/base/configs/current/labels/labels.yaml

In response to this:

What this PR does / why we need it:

Renames the label topic/testing to area/testing.

Note: after merge it will take a while for the labels to consolidate, since the jobs runs only once every day.

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 #

Special notes for your reviewer:

/cc @vladikr @brianmcarey

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