Clean-up Tracing

[dragonchaser]

Tracing contains lots of outdated code since we only do otel. (jaeger supports otel aswell). We can get rid of most of the configuration variables.

• config.Tracing.enabled (tracing is enabled implicit, and is only logged when config.Tracing.Endpoint is provided)
• config.Tracing.Collector is obsolete (config.Tracing.Endpoint serves the same purpose)
• config.Tracing.Type is obsolete, as mentioned everybody does otel

I suggest doing this before #4828.

/cc @butonic

follow-up to #7012 and #9622