Fix span export issue when user provided SpanProcessor beans exist

SpanProcessor implementations are hooked into OTel in Quarkus
via the AutoConfiguredOpenTelemetrySdkBuilder#addTracerProviderCustomizer
mechanism, which in turn obtains those processor from CDI.
However, because LateBoundBatchSpanProcessor (which is the one
that ends up being responsible for the span export
via its BatchSpanProcessor delegate) was marked as a
@DefaultBean, when a user provided SpanProcessor became
part of the application, the LateBoundBatchSpanProcessor
was completely ignored.
The fix is simply to remove @DefaultBean and always have
LateBoundBatchSpanProcessor be considered as a SpanProcessor.

Fixes: #33407

extensions/opentelemetry/runtime/src/main/java/io/quarkus/opentelemetry/runtime/exporter/otlp/OtlpExporterProvider.java

@@ -3,14 +3,11 @@
 import jakarta.enterprise.inject.Produces;
 import jakarta.inject.Singleton;
 
-import io.quarkus.arc.DefaultBean;
-
 @Deprecated
 @Singleton
 public class OtlpExporterProvider {
     @Produces
     @Singleton
-    @DefaultBean
     public LateBoundBatchSpanProcessor batchSpanProcessorForOtlp() {
         return new LateBoundBatchSpanProcessor();
     }