Classes from ShapeConstruct duplicating the ones from Convert package are removed.
Protection against joining segments when degree is 1 is introduced in Convert classes.
Optimization previously made in Convert_CompBezierCurvesToBSplineCurve class (within #25256) is applied to 2d equivalent.
Data for automatic upgrade procedure are extended to replace removed classes by their duplicates from Convert.
// cout disabled unless OCCT_DEBUG is defined
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