Remove AutoLabels and auto_labels.py

Unused after plotter class removal.

https://claude.ai/code/session_01B9sVEV54XWCa2LJw1C8gvv

Author: claude

autoarray/plot/__init__.py

@@ -19,7 +19,6 @@ def _set_backend():
 
 from autoarray.plot.wrap.base.output import Output
 
-from autoarray.plot.auto_labels import AutoLabels
 
 from autoarray.plot.plots import (
     plot_array,