Werk #7247: ps.perf: Fixed incomplete counter cleanup routine, leading to ever-growing counter state files

The ps check regularly creates counter values with dyamic names and save them into the counter state file. There is a cleanup routine which removes outdated counters.

This cleanup routine failed at cleaning up counter values from the deprecated ps.perf check. As a result the check counters file did steadily grow. This has been fixed. The cleanup now also checks for outdated ps.perf counters.

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