Purpose

Currently Dynamo Revit contains a copy of Dynamo's Selection node text formatting logic. This PR removes the duplicated code so that Dynamo Revit nodes use Dynamo's base selection node logic to format their textual representation (list of element ids).

Declarations

Check these if you believe they are true

• The code base is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• Snapshot of UI changes, if any.

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