Seth Hillbrand 408e1feae2 Fix Chessboard splitting
Due to a bug(?) in Clipper2, 45° collinear edges may not be detected.
See https://github.com/AngusJohnson/Clipper2/issues/1008 for current
status.  In the meantime, we pre-process these to remove the extraneous
joints preventing our triangulation from getting mixed up

Fixes https://gitlab.com/kicad/code/kicad/-/issues/18176
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..
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