Fix "this-escape" compiler warnings (BrokerTopicMetrics) for JDK 23

> Task :storage:compileJava FAILED
/root/kafka/storage/src/main/java/org/apache/kafka/storage/log/metrics/BrokerTopicMetrics.java:62: warning: [this-escape] possible 'this' escape before subclass is fully initialized
        this(Optional.empty(), remoteStorageEnabled);
            ^
/root/kafka/storage/src/main/java/org/apache/kafka/storage/log/metrics/BrokerTopicMetrics.java:106: warning: [this-escape] previous possible 'this' escape happens here via invocation
            metricGaugeTypeMap.put(RemoteStorageMetrics.REMOTE_COPY_LAG_BYTES_METRIC.getName(), new GaugeWrapper(RemoteStorageMetrics.REMOTE_COPY_LAG_BYTES_METRIC.getName()));
                                                                                                ^
/root/kafka/storage/src/main/java/org/apache/kafka/storage/log/metrics/BrokerTopicMetrics.java:66: warning: [this-escape] possible 'this' escape before subclass is fully initialized
        this(Optional.of(name), remoteStorageEnabled);
            ^
/root/kafka/storage/src/main/java/org/apache/kafka/storage/log/metrics/BrokerTopicMetrics.java:106: warning: [this-escape] previous possible 'this' escape happens here via invocation
            metricGaugeTypeMap.put(RemoteStorageMetrics.REMOTE_COPY_LAG_BYTES_METRIC.getName(), new GaugeWrapper(RemoteStorageMetrics.REMOTE_COPY_LAG_BYTES_METRIC.getName()));