Improve reliability/readability of bin tests scripts and failure output #2044
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The src/test/bin tests have been failing intermittently in the CI checks, and the problem appears to be known instability in CMake's
file(DOWNLOAD)
when invoked from processes in GitHub actions. The downloaded files occasionally have 0 size.This change brings the test images into the git repo rather than downloading them from
https://github.com/AcademySoftwareFoundation/openexr-images at configure time. I did that originally to avoid repo bloat, but it's unreliable. I trimmed the list of files used by the tests, so the additional data is not that significant, a few Mb.
This also restructures the test scripts to produce more informative output, and restructures the CI steps to make it easier to navigate the logs.