prow: add release-note and require-matching-label to k/autoscaler

[jackfrancis]

This PR updates the prow configuration for the kubernetes/autoscaler repository to add the release-note and require-matching-label plugins.

More specifically, we want block PR merges that don't declare an area/ label prefix.

[jackfrancis]

@towca @gjtempleton @raywainman can I get an additional +1 from another SIG Autoscaling lead?

[raywainman]

/lgtm

[jackfrancis]

/assign @dims

[jackfrancis]

/assign @wojtek-t

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, jackfrancis

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[k8s-ci-robot]

@jackfrancis: Updated the following 2 configmaps:

• config configmap in namespace default at cluster test-infra-trusted using the following files:
  • key config.yaml using file config/prow/config.yaml
• plugins configmap in namespace default at cluster test-infra-trusted using the following files:
  • key plugins.yaml using file config/prow/plugins.yaml

In response to this:

This PR updates the prow configuration for the kubernetes/autoscaler repository to add the release-note and require-matching-label plugins.

More specifically, we want block PR merges that don't declare an area/ label prefix.

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