[Scesim Editor] Filter dmn files from target foulder

During creation of scesim file user need to choose DMN which he wish to test.
After building a project in VS code and consequently creating * target* fouler there is always duplicates of the same DMN would exist so user could see it in the menu of scesim creation dialog.

Idea is that since user should newer use/show those temporal dmn from target fouler to remove it as error prone functionality.