Add minimal backtrace to cache spans in performance tests

Problem/Motivation

This is possible following 📌 Separate cache operations from database queries in OpenTelemetry and assertions Fixed . We can collect a backtrace, and find the first non-cache method caller, then add this as an attribute in OpenTelemetry spans. Database query events do similar.

Steps to reproduce

Proposed resolution

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Remaining tasks

User interface changes

API changes

Data model changes

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