ITS: tracker shadowed variable

[f3sch]

• sets the memory limit to high by default effectively disabling it (also then not printing it as config)
• use LOG instead of std::cost in TF
• rework the prepareCluster function a bit to use std more and not double loop
• also I saw in one test a crash if no tracks were produced, I suspect this was not really a problem and the code handled it before correctly but if no tracks were found we can skip all this entirely anyways

[github-actions]

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