cubicweb #17054804 virtualenv: make old-style cubes installed in editable mode work [rejected]

Old style cubes that are pip installed in editable mode are not seen by cw (3.24) since they are added to easy-install.pth (which we actually do not want, but that's another story) and a <cube>.egg-link is created by pip (to track installed packages). None of these mechanisms are used by cw when it look for a cube.

We could use the egg-link file to automatically add these directories to the cubes.__path__ ( in CubicWebNoAppConfiguration.cubes_search_path() ).

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patch[config] automatically look for old style cubes in egg-link files (closes #17054804) [rejected]