Show a warning when uploading a Geo/DataFrame without geometry

[josemazo]

Story ch59311

[Jesus89]

The to_carto function allows passing the geom_col param, so the detection of the geometry column must be done after the geometry setup. We can have also situations with a GeoDataFrame without a valid geometry column, or a GeoDataFrame with a geometry column different than the_geom (by default is geometry).

So IMO, we should remove the is_geodataframe flag detection and the first warning, and keep only the last one with a slightly different content:

if has_geometry(gdf):
   ...
elif isinstance(dataframe, GeoDataFrame):
   log.warning('Geometry column not found in the GeoDataFrame.')

[josemazo]

Totally right! Ready for review again.