retain unlabeled axis behavior in `vba_choropleth()`

[jGaboardi]

• retain current unlabeled axis functionality from stable geopandas (v1.1.3 currently) plotting for vba_choropleth()
• introduce a axis_labels=False keyword and include the following here like so (from @martin's comment):

gdf.plot(color=rgba, ax=ax)
if not axis_labels:
    ax.set_xlabel("")
    ax.set_ylabel("")

• xref review RMS tolerance failures in dev #295

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Any thoughts against?

cc @martinfleis @knaaptime @sjsrey