testing: env variable OSL_TESTSUITE_THRESH_SCALE scales test thresholds #1934
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For any individual test running, the OSL_TESTSUITE_THRESH_SCALE environment variable, if set, will scale the image comparison thresholds used to decide if a test passes.
Furthermore, a special OSL_TESTSUITE_OPTIX_THRESH_SCALE environment variable, if set, will cause all OptiX related tests to be set up with scaled thresholds.