Make coordinate detection more robust #3437
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Description Of Changes
This works around an issue where some ERA5 data had lat/lon with a "positive" attribute that, according to the CF specification, should indicate a vertical coordinate. We can fix this up by making sure each coordinate variable is only associated with a single option, and making use of Python's key-ordered dictionaries to prioritize the matching order. Having lat be y and lon be x is already handled by a later block.
Checklist