Werk #18178: otel: Improve histogram value calculation

Component	Checks & agents
Title	otel: Improve histogram value calculation
Date	Aug 19, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p11 Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Improve the value used for metrics for histograms and exponential histograms by using the average value (sum/count) instead of just the count value.

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