remove ncep plots

[szy21]

Purpose

Because it causes problems sometimes: https://buildkite.com/clima/climacoupler-ci/builds/4323#019132d5-b350-40e4-97e3-e267783690f9/201-498 and not many people look at it.

To-do

Content

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• [ ] I have read and checked the items on the review checklist.