feat: Aws Lambda Request Handler instrumentation uses OTEL_INSTRUMENTATION_AWS_LAMBDA_FLUSH_TIMEOUT

Using `WrapperConfiguration.flushTimeout()` for consistency with `TracingRequestStreamWrapper`

Author: smoke

instrumentation/aws-lambda/aws-lambda-core-1.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/awslambdacore/v1_0/AwsLambdaRequestHandlerInstrumentation.java

@@ -5,6 +5,7 @@
 
 package io.opentelemetry.javaagent.instrumentation.awslambdacore.v1_0;
 
+import static io.opentelemetry.instrumentation.awslambdacore.v1_0.internal.WrapperConfiguration.flushTimeout;
 import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
 import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
 import static io.opentelemetry.javaagent.instrumentation.awslambdacore.v1_0.AwsLambdaInstrumentationHelper.functionInstrumenter;
@@ -59,6 +60,8 @@ public void transform(TypeTransformer transformer) {
   @SuppressWarnings("unused")
   public static class HandleRequestAdvice {
 
+    private final static long flushTimeoutNanos = flushTimeout().toNanos();
+
     @Advice.OnMethodEnter(suppress = Throwable.class)
     public static void onEnter(
         @Advice.Argument(value = 0, typing = Typing.DYNAMIC) Object arg,
@@ -90,7 +93,7 @@ public static void stopSpan(
         functionInstrumenter().end(functionContext, input, null, throwable);
       }
 
-      OpenTelemetrySdkAccess.forceFlush(1, TimeUnit.SECONDS);
+      OpenTelemetrySdkAccess.forceFlush(flushTimeoutNanos, TimeUnit.NANOSECONDS);
     }
   }
 }