vector: Adding test cases for the module V.delaunay #5539
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This pull request introduces a comprehensive test suite for the v.delaunay module in GRASS GIS. It verifies the correctness of Delaunay triangulation under various scenarios, including standard random point inputs, collinear points (which should produce no areas), the minimum valid number of points (three), and inputs with duplicate coordinates (ensuring deduplication). Additionally, it tests the behavior of the -r and -l flags to confirm expected changes in topology, such as region-limited triangulation and line-only output.