Add Ubuntu 24.04 support (open-telemetry#489)

Author: Aleksandr-Melnikov

exporters/user_events/include/opentelemetry/exporters/user_events/logs/recordable.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include "opentelemetry/nostd/string_view.h"
 #include "opentelemetry/logs/severity.h"
 #include "opentelemetry/sdk/common/attribute_utils.h"

exporters/user_events/src/metrics_exporter.cc

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "opentelemetry/exporters/user_events/metrics/exporter.h"
+#include "opentelemetry/proto/collector/metrics/v1/metrics_service.pb.h"
 
 #include "tracepoint/tracepoint.h"