Werk #14780: Remove thresholds to new carbon/influxdb/RRD metrics

The thresholds for the metrics Carbon Overflows Rate, Carbon Queue Usage, InfluxDB Overflows Rate, InfluxDB Queue Usage, RRD Overflows Rate, and RRD Queue Usage would unnecessarily set the OMD Performance service in WARN or CRIT. These metrics are used mostly internally and are of lesser importance to the end users. Therefore, the thresholds and their configuration are now removed entirely.

These thresholds will be removed from the configuration after an update.

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