Use CalculateProductOfElements in Denoising, ImageStatistics, and IO tests

[N-Dekker]

Replaced for loops with equivalent calls to Size::CalculateProductOfElements().

Most cases were found by the following regular expression:

^([ ]+)for .+\r\n\1{\r\n\1  .+\*= .+Size.+;\r\n\1}

[N-Dekker]

The ITK.Linux CI failures appear unrelated to this pull request:

Internal ctest changing into directory: /home/vsts/work/1/s-build/Testing/Temporary/ITKImageFeature
CMake Error: Unable to read from file 'itkHessianRecursiveGaussianFilterTest.txt': Can't lstat itkHessianRecursiveGaussianFilterTest.txt
Error creating tar while encoding file: /home/vsts/work/1/s-build/Testing/Temporary/ITKImageFeature/itkHessianRecursiveGaussianFilterTest.txt
...

[N-Dekker]

/azp run ITK.Linux

[thewtex]

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