Switch guest-configs to manage PRs with copybara instead of tide

[a-crate]

/hold

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-crate, michelle192837

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[a-crate]

/unhold

[google-oss-prow]

@a-crate: Updated the following 2 configmaps:

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

In response to this:

/hold

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