Fixed plot paths in NCL provenance tracking

[schlunma]

Description

Currently, many plot paths in NCL diagnostics are invalid. Since #3332, this leads to errors in the corresponding diagnostics (see also #3414). This PR fixes those and also makes sure to output a proper error message if an invalid plot path is used to prevent this issue in the future.

• Closes Ncl log_provenance in interface_script seems broken #3420

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New or updated recipe/diagnostic

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• 🛠 Provenance information has been added

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[schlunma]

Note: I did not run any recipe (these are way too many). @zklaus could you maybe run the tests from #3414 again with only the NCL recipes?

[zklaus]

I ran the Ncl recipes and this is definitively a big step forward. Some recipes fail for other reasons, but let's get it in and work from there.