fix: speed up the test execution

The test method NeonBeeMetricsTest#testCustomMetric occasionally takes
more than a minute to execute. By setting setIgnoreClassPath to true,
the test will execute in less than 15 seconds.

src/test/java/io/neonbee/endpoint/metrics/NeonBeeMetricsTest.java

@@ -65,6 +65,7 @@ void testCustomMetric(Vertx vertx, VertxTestContext context) {
 
         NeonBeeOptions.Mutable mutable = new NeonBeeOptions.Mutable();
         mutable.setServerPort(PORT);
+        mutable.setIgnoreClassPath(true);
         mutable.setWorkingDirectory(Path.of("src", "test", "resources", "io", "neonbee", "endpoint", "metrics"));
 
         NeonBee.create(mutable).onComplete(context.succeeding(event -> httpGet(vertx, TEST_ENDPOINT_URI)