fix(k8s-system-coredns): add datasource for the job variable

[alexintech]

Pull Request

Required Fields

:mag_right: What kind of change is it?

• fix

:dart: What has been changed and why do we need it?

• Added datasource for the job variable in CoreDNS dashboard. It fixes CoreDNS dashboard if Grafana has multiple datasources

[dotdc]

:tada: This PR is included in version 1.1.0 :tada:

The release is available on GitHub release

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