Handle redirects in opentelemetry tracing

Problem/Motivation

When a request that's recorded for Open Telemetry causes a redirect, like a form submission, PerformanceTestBase doesn't look for it, so time to first byte etc. looks a bit off. We should be able to check the performance log for a redirect and show that in the grafana UI in a sensible way.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet