TEST: Fix unexercised tests for large image read/write

[jadh4v]

PR Checklist

• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)
• Added test (or behavior not changed)
• Updated API documentation (or API not changed)
• Added license to new files (if any)
• Added Python wrapping to new files (if any) as described in ITK Software Guide Section 9.5
• Added ITK examples for all new major features (if any)

Refer to the ITK Software Guide for
further development details if necessary.

Closes: #3703

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[dzenanz]

ITK doesn't recognize TEST: prefix, so you should use ENH: in the commit message. Otherwise looks good.

[jadh4v]

ITK doesn't recognize TEST: prefix, so you should use ENH: in the commit message. Otherwise looks good.

Updated the commit msg to use ENH

[blowekamp]

It looks like each of these tests needs 5 GB of memory and can not be run concurrently on memory constrained system. Please add something like the following for each memory intensive test:

   set_tests_properties(itkComposeBigVectorImageFilterTest
            PROPERTIES
            RESOURCE_LOCK
            MEMORY_SIZE)

This will ensure only one test with "MEMORY_SIZE" resource constrained is run at a time.