Werk #12632: entity_sensors_temp: remove default temperature levels

The check entity_sensors_temp monitors temperature sensors on devices mapped to the ENTITY-MIB. These sensors monitor the temperature of different hardware components: CPU, chassis ambient, and accelerator. It does not make sense to define a default upper temperature limit, as acceptable temperature levels vary greatly across the different components. Default levels have therefore been removed. It is still possible to configure upper temperature levels for each of the sensors.

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