Geometry_Engine: DiscontinuityPoints does not worked for open PolyCurves

[peterjamesnugent]

Description:

PolyCurve.DiscontinuityPoints() does not work when PolyCurve.IsClosed() == false.

Steps to reproduce:

Test file

Expected behaviour:

Current method uses EndPoint which defaults to the fallback method, needs to use IEndPoint.

Test file(s):

https://burohappold.sharepoint.com/:u:/r/sites/BHoM/02_Current/12_Scripts/01_Issue/BHoM/BHoM_Engine/Geometry_Engine/%233365-DiscontinuityPointsForPolyCurve.gh?csf=1&web=1&e=g5pYK0