Describe the Enhancement

For unstructured grid input, get the model initialization time from the forecast_reference_time variable for LFRic input files.

vx_data2d_nc_cf gets the InitTime from

• forecast_reference_time variable if exists
• from the filename

The same logic is expected to be implemented for Unstructured grid library. This should be added to the unittest.

This was from dtcenter/METplus#2862

Time Estimate

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1 day

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2702701

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