Remove unneeded cleanup from test output preprocessing

With the patch, we are trying in Geant4 where we flush output stream at some point standard output changed a bit and one of the preprocessors in tests fails, so I remove it. It should not be needed actually as anyhow I do try to catch garbage in a different way. All preprocessing related to garbage characters is removed. Since the flush changes the order of output, all the test references are updated.

Requires Geant4 v106r2p3