Switch en-server from internal Prow to OSS Prow.

[cjwagner]

Depends on #375

Hold for validation of dependent PR and synchronized merge with internal PR to disable automation on internal Prow.
/hold

/assign @crwilcox @sethvargo @fejta

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjwagner, sethvargo

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[cjwagner]

/hold cancel

[google-oss-robot]

@cjwagner: Updated the following 2 configmaps:

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

In response to this:

Depends on #375

Hold for validation of dependent PR and synchronized merge with internal PR to disable automation on internal Prow.
/hold

/assign @crwilcox @sethvargo @fejta

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