nit: trace span for regular task (#8053)

Logs are too spammy

---------

Co-authored-by: Anton Panasenko <apanasenko@openai.com>

codex-rs/otel/src/otel_manager.rs

@@ -25,7 +25,7 @@ use std::time::Instant;
 use strum_macros::Display;
 use tokio::time::error::Elapsed;
 use tracing::Span;
-use tracing::info_span;
+use tracing::trace_span;
 use tracing_opentelemetry::OpenTelemetrySpanExt;
 
 #[derive(Debug, Clone, Serialize, Display)]
@@ -67,7 +67,7 @@ impl OtelManager {
         terminal_type: String,
         session_source: SessionSource,
     ) -> OtelManager {
-        let session_span = info_span!("new_session", conversation_id = %conversation_id, session_source = %session_source);
+        let session_span = trace_span!("new_session", conversation_id = %conversation_id, session_source = %session_source);
 
         if let Some(context) = traceparent_context_from_env() {
             session_span.set_parent(context);

codex-rs/otel/src/otel_provider.rs

@@ -134,7 +134,7 @@ impl OtelProvider {
         self.tracer.as_ref().map(|tracer| {
             tracing_opentelemetry::layer()
                 .with_tracer(tracer.clone())
-                .with_filter(LevelFilter::INFO)
+                .with_filter(LevelFilter::TRACE)
         })
     }