add kcp-dev/kcp-operator to Prow

[xrstf]

This PR fixes a stray whitespace in the README for the build image.

Oh, and it also adds the new kcp-operator repo to Prow.

[kcp-ci-bot]

LGTM label has been added.

Git tree hash: 86fac70a409d8457c7cfff86221c0327b8f45dad

[xrstf]

/approve

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: embik, xrstf

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kcp-dev/infra/blob/main/OWNERS)~~ [xrstf] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[kcp-ci-bot]

@xrstf: Updated the following 3 configmaps:

• job-config configmap in namespace prow at cluster default using the following files:
  • key prow-jobs-kcp-dev-kcp-operator-kcp-operator-presubmits.yaml using file prow/jobs/kcp-dev/kcp-operator/kcp-operator-presubmits.yaml
• plugins configmap in namespace prow at cluster default using the following files:
  • key plugins.yaml using file prow/plugins.yaml
• config configmap in namespace prow at cluster default using the following files:
  • key config.yaml using file prow/config.yaml

In response to [this](https://github.com/kcp-dev/infra/pull/74): >This PR fixes a stray whitespace in the README for the build image. > >Oh, and it also adds the new kcp-operator repo to Prow. Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.