Removing New Relic CronJob Monitoring content

[savitharaghunathan]

This PR removes content related to New Relic CronJob Monitoring.
Edited page - https://kubernetes.io/docs/tasks/debug-application-cluster/resource-usage-monitoring/#new-relic-kubernetes-monitoring-integration

Issue #15770

[k8s-ci-robot]

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[savitharaghunathan]

/assign @stewart-yu

[xiangpengzhao]

ping @jimangel as this is similar to your merged PR #10458

[aimeeu]

@xiangpengzhao @jimangel @stewart-yu Vendor-specific content has been removed in PR #15747 - which is waiting for final approval

[xiangpengzhao]

As per @aimeeu 's comment, the change in this PR is already included in the earlier PR #15747. I'm going to close this PR. Thanks @snathan13 anyway and welcome for further contributions!
/close

[k8s-ci-robot]

@xiangpengzhao: Closed this PR.

In response to this:

As per @aimeeu 's comment, the change in this PR is already included in the earlier PR #15747. I'm going to close this PR. Thanks @snathan13 anyway and welcome for further contributions!
/close

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