Instrumentation: OpenTracing jaeger exporter vs. OpenTelemetry tracer feature parity

[kvrhdn]

This is an issue to track differences between the OpenTracing Jaeger exporter (the default) and the newer OpenTelemetry tracer. The OTel tracer was added to Tempo with #842 and is currently behind a feature flag (use_otel_tracer)
I'll update this issue has new problems show up and problems get solved.

The OpenTracing Jaeger client: https://github.com/jaegertracing/jaeger-client-go
The OpenTelemetry Jaeger exporter: https://github.com/open-telemetry/opentelemetry-go/tree/main/exporters/jaeger

Features missing

• Sampling can not be configured using environment variables
• No support for the Jaeger remote sampling protocol
  • PR to add this to otel-go: Add Jaeger remote sampler open-telemetry/opentelemetry-go-contrib#936
• In general, there are less environment variables to tune performance
  • For instance, we sometimes set JAEGER_REPORTER_MAX_QUEUE_SIZE but maybe this isn't necessary with otel-go?

[github-actions]

This issue has been automatically marked as stale because it has not had any activity in the past 60 days.
The next time this stale check runs, the stale label will be removed if there is new activity. The issue will be closed after 15 days if there is no new activity.
Please apply keepalive label to exempt this Issue.