Removing helm/charts from test-infra

[mattfarina]

The charts repo is no longer supported. It no longer gets new
contributions. So, this change is to remove test-infra config
that has been used to support the charts repo. See
https://helm.sh/blog/helm-2-becomes-unsupported/

[scottrigby]

Cross-linking helm/charts#23944

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chases2, mattfarina

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[k8s-ci-robot]

@mattfarina: Updated the following 3 configmaps:

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

In response to this:

The charts repo is no longer supported. It no longer gets new
contributions. So, this change is to remove test-infra config
that has been used to support the charts repo. See
https://helm.sh/blog/helm-2-becomes-unsupported/

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