Polygon: delete last vertex if it equals the first one

[katehryhorenko]

BACKGROUND:
In drywall function the data exported from Revit and then proceed by transformation/union etc. can cause the creation of polygon where the last vertex duplicated the first one. "Edges" method tries to create a segment from this two points and fails (the line is too short)

DESCRIPTION:

• Delete the last vertex if it equals the first one as part of polygon validation

TESTING:

• I published Drywall function with this change. It might be worth creating a test

REQUIRED:

• All changes are up to date in CHANGELOG.md.

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This change is 

[andrewheumann]

I think this is supposed to already be handled by the RemoveSequentialDuplicates method — can we investigate why that's not working? It is being called with wrap = true, which should mean it checks if the first / last vertex are identical. Perhaps something is being changed in the DeleteVerticesForOverlappingEdges method?

Reviewable status: 0 of 1 approvals obtained