Werk #8630: ups_bat_temp, ups_capacity, ups_in_freq, ups_in_voltage, ups_out_load, ups_out_voltage, ups_power, ups_test: Extend and unify range of discovered devices

Due to overly specific SNMP scan functions, discovery did not work properly for these checks on some devices, or only for some of these checks, despite being based on the same MIB. This has been fixed.

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