Use jakarta.servlet.error.exception request attribute on jetty11 (#8503)

instrumentation/jetty/jetty-common/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/jetty/common/JettyHelper.java

@@ -57,6 +57,7 @@ public class JettyHelper<REQUEST, RESPONSE> extends ServletHelper<REQUEST, RESPO
   }
 
   private static String errorExceptionAttributeName() {
+    // this method is only used on jetty versions before 9.4
     return "javax.servlet.error.exception";
   }
 }

instrumentation/servlet/servlet-5.0/javaagent/src/test/groovy/JettyServlet5Test.groovy

@@ -43,7 +43,7 @@ abstract class JettyServlet5Test extends AbstractServlet5Test<Object, Object> {
     ServletContextHandler servletContext = new ServletContextHandler(null, contextPath)
     servletContext.errorHandler = new ErrorHandler() {
       protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message) throws IOException {
-        Throwable th = (Throwable) request.getAttribute("javax.servlet.error.exception")
+        Throwable th = (Throwable) request.getAttribute("jakarta.servlet.error.exception")
         writer.write(th ? th.message : message)
       }
     }

instrumentation/servlet/servlet-5.0/javaagent/src/test/groovy/JettyServletHandlerTest.groovy

@@ -34,7 +34,7 @@ class JettyServletHandlerTest extends AbstractServlet5Test<Object, Object> {
     setupServlets(handler)
     server.addBean(new ErrorHandler() {
       protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message) throws IOException {
-        Throwable th = (Throwable) request.getAttribute("javax.servlet.error.exception")
+        Throwable th = (Throwable) request.getAttribute("jakarta.servlet.error.exception")
         writer.write(th ? th.message : message)
       }
     })