Remove okhttp debug output from smoke tests (open-telemetry#8944)

Author: laurit

smoke-tests/src/test/java/io/opentelemetry/smoketest/AbstractTestContainerManager.java

@@ -23,7 +23,11 @@ protected Map<String, String> getAgentEnvironment(
     // while modern JVMs understand linux container memory limits, they do not understand windows
     // container memory limits yet, so we need to explicitly set max heap in order to prevent the
     // JVM from taking too much memory and hitting the windows container memory limit
-    environment.put(jvmArgsEnvVarName, "-Xmx512m -javaagent:/" + TARGET_AGENT_FILENAME);
+    environment.put(
+        jvmArgsEnvVarName,
+        "-Xmx512m -javaagent:/"
+            + TARGET_AGENT_FILENAME
+            + " -Dio.opentelemetry.javaagent.slf4j.simpleLogger.log.okhttp3.internal.concurrent.TaskRunner=INFO");
     environment.put("OTEL_BSP_MAX_EXPORT_BATCH_SIZE", "1");
     environment.put("OTEL_BSP_SCHEDULE_DELAY", "10ms");
     environment.put("OTEL_METRIC_EXPORT_INTERVAL", "1000");