Test data for new ocean buoys regridding example in iris_example_code.

This data is extracted from ```/data/local/dataZoo/NetCDF/oceanObs/EN3_v2a_Profiles_195001.nc```.
It contains just + only what is needed by the new notebook example covered by https://github.com/SciTools/iris_example_code/pull/2 .  
(Result is about 10% reduction ~ 1.5Mb of 15Mb original)

If that is to be merged, it needs this first.