WIP Attempt to fix CI

[dzenanz]

This is a less aggressive rework of #437.

[dzenanz]

Test failures from e.g. build-test-python-superbuild (macos-15):

The following tests FAILED:
	149 - DeformAVolumeWithAThinPlateSplineTestBaselineComparisonPython (Failed)
	229 - ComputeFFTInOneDimensionModulusBaselineComparisonPython (Failed)
	230 - ComputeFFTInOneDimensionPhaseBaselineComparisonPython (Failed)
	231 - ComputeInverseFFTOfImageTestBaselineComparisonPython (Failed)
	232 - ComputeFFTInOneDimensionTestPython (Failed)
	286 - ResampleAnImageTestBaselineComparisonPython (Failed)
	320 - ConvertRGBImageToGrayscaleImageTestBaselineComparisonPython (Failed)

and from CDash:

Test: ComputeFFTInOneDimensionModulusBaselineComparisonPython (Failed) Build: InsightSoftwareConsortium/ITKSphinxExamples-macos-15--refs/pull/439/merge (GitHubActions) on 2025-01-31 19:26:54 Repository revision: bdd24a7cc1b7a1d841c5c3e435dcb5b0367e9875 Test Details: Completed (Failed)

Command line: /Users/runner/work/bld/ITKEx-build/bin/ImageCompareCommand "--test-image" "/Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputPython.mha.sha512" "--baseline-image" "/Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512"

Test output

Exception detected while reading /Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512 : 
itk::ImageFileReaderException (0x600003ca0800)
Location: "unknown" 
File: /Users/runner/work/bld/ITK/Modules/IO/ImageBase/include/itkImageFileReader.hxx
Line: 135
Description:  Could not create IO object for reading file /Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512
The file doesn't exist. 
Filename = /Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512


Exception detected while reading /Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512 : 
itk::ImageFileReaderException (0x600003ca0800)
Location: "unknown" 
File: /Users/runner/work/bld/ITK/Modules/IO/ImageBase/include/itkImageFileReader.hxx
Line: 135
Description:  Could not create IO object for reading file /Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512
The file doesn't exist. 
Filename = /Users/runner/work/bld/ITKEx-build/src/Filtering/FFT/ComputeFFTInOneDimension/MouseLiver1DFFTModulusOutputBaseline.mha.sha512


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