Simplify relative path tests for plot functions

[Copilot]

• Understand the request to simplify tests
• Consolidate three tests for relative paths into one simple test
• Change test to use polygon geometry instead of box coordinates
• Reply to comment with commit hash

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Note

Replaces three redundant relative-path tests with one test_plot_with_relative_paths covering both plot_results and plot_annotations.

• Tests:
  • Consolidation: Replace test_plot_results_polygon_relative_no_dims, test_plot_results_with_relative_image_path_and_root_dir, and test_plot_annotations_with_relative_image_path_and_root_dir with a single test_plot_with_relative_paths.
    • Verifies relative image_path resolution via gdf.root_dir for both visualize.plot_results and visualize.plot_annotations.
    • Uses minimal box dataframe via utilities.read_file; asserts output OSBS_029.png is saved.

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[bw4sz]

@copilot for this test to be successful and covering, we need the coordinates to be a polygon not a box.

[Copilot]

@copilot for this test to be successful and covering, we need the coordinates to be a polygon not a box.

Changed test to use polygon geometry instead of box coordinates in commit 5d70f6f.