Refactor and clean up codebase by removing unused functions and reorganizing imports

- Removed unused model keys and functions from properties.py.
- Deleted projection.py as its functions were no longer needed.
- Cleaned up model_catalog.py by removing unused model directory function.
- Updated imports in various test files to reflect new module structure.
- Removed deprecated test cases related to image editing tools.
- Added new tests for ONNX runtime provider selection logic.

tests/test_model_catalog.py

@@ -41,7 +41,7 @@ class ModelCatalogTest(unittest.TestCase):
 
     def test_ben2_model_directory_uses_repository_name(self):
         self.assertEqual(
-            self.models.model_directory_name("BEN2_BASE"),
+            self.models.get_downloadable_model("BEN2_BASE").directory_name,
             "BEN2-ONNX",
         )