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 Ultimate MT 2.4.0p11 Checkmk Ultimate, 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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