Refactor tests and remove unused imports

- Cleaned up test files by removing unnecessary imports and unused parameters.
- Simplified test functions by eliminating redundant parameterization and consolidating logic.
- Updated test cases to directly use defined values instead of parameterized inputs where applicable.
- Enhanced readability and maintainability of the test code across various test files.

src/anyimage/operators/cutout_tool/geometry.py

@@ -238,10 +238,6 @@ def extract_selection_contours(selection_values, max_resolution=512, threshold=0
         image_size=source_size,
     )
 
-
-POINT_SPACING = 0.1
-
-
 def contour_area(points):
     import numpy as np
 
@@ -560,19 +556,6 @@ def crop_plane_bounds(source_object, crop_bounds, source_size):
     )
 
 
-def extract_cutout_contours(
-    content_values,
-    sampling_resolution,
-    threshold=CUTOUT_ALPHA_THRESHOLD,
-):
-    contour_resolution = max(512, min(round(sampling_resolution * 8), 1024))
-    return extract_selection_contours(
-        content_values,
-        max_resolution=contour_resolution,
-        threshold=threshold,
-    )
-
-
 def effective_cutout_edge_length(
     context,
     source_object,