Changing to using BHoM join instead of RhinoJoin when converting polycurves to avoid Rhino Crash

[IsakNaslundBh]

NOTE: Depends on

Issues addressed by this PR

Closes #220

Using BHoM Join instead of Rhino join to check if the curve can be coverted.

This is to avoid full blown crashes of Rhino from happening that can for some cases be triggered by the Rhino.Join method that was used.

Test files

https://burohappold.sharepoint.com/:f:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/Rhinoceros_Toolkit/%23221-AvoidCallingRhinoJoinToStopRhinoCrashWhenConvertingPolycurves?csf=1&web=1&e=UMB25Z

Changelog

Additional comments

[FraserGreenroyd]

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[FraserGreenroyd]

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[FraserGreenroyd]

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