feat: add risk label group

[slimm609]

• add support for a risk label group as well as "needs-risk"

This is a community contribution from just consuming open source prow in github enterprise

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[krzyzacy]

is this coming from some sig meetings? could you link an associated issue?

[slimm609]

is this coming from some sig meetings? could you link an associated issue?

No, this is not coming from a meeting. Just a community contribution to support the risk category

[BenTheElder]

/hold
We should not be adding built in label type support without discussion within the broader project.

If you want to use your own arbitrary labels for deployments of prow that are not kubernetes, the label plugin supports this already