Fix random test failures caused by dev server timeouts

There were two instances of the dev server being created at the same
time by different tests tasks, causing one of the them to `pkill` both
instances.

This PR fixes that along with tracking the dev server process and
destroying it when tests are finish running.

inngest-spring-boot-demo/src/main/java/com/inngest/springbootdemo/DevServerComponent.java

@@ -15,10 +15,11 @@ public class DevServerComponent {
     static String baseUrl = "http://127.0.0.1:8288";
     OkHttpClient httpClient = new OkHttpClient();
 
+    Process devServerProcess;
+
     DevServerComponent(CommHandler commHandler) throws Exception {
         Runtime rt = Runtime.getRuntime();
-        rt.exec("pkill inngest-cli");
-        rt.exec("npx -y inngest-cli dev -u http://127.0.0.1:8080/api/inngest");
+        devServerProcess = rt.exec("npx -y inngest-cli@latest dev -u http://localhost:8080/api/inngest --port 8288 --no-discovery --no-poll --retry-interval 1");
 
         waitForStartup(commHandler);
     }
@@ -32,7 +33,7 @@ private void waitForStartup(CommHandler commHandler) throws Exception {
 
                 try (Response response = httpClient.newCall(request).execute()) {
                     if (response.code() == 200) {
-                        Thread.sleep(3000);
+                        Thread.sleep(6000);
                         commHandler.register("http://localhost:8080", null);
                         return;
                     }
@@ -102,8 +103,9 @@ private <T> T makeRequest(Request request, TypeReference<T> typeReference) throw
 
 
     @PreDestroy
-    public void stop() throws Exception {
-        Runtime rt = Runtime.getRuntime();
-        rt.exec("pkill inngest-cli");
+    public void stop()  {
+        if (devServerProcess != null && devServerProcess.isAlive()) {
+            devServerProcess.destroy();
+        }
     }
 }

inngest-spring-boot-demo/src/test/java/com/inngest/springbootdemo/DevModeIntrospectionTest.java

@@ -4,6 +4,8 @@
 import com.inngest.Version;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledIfSystemProperty;
+import org.junit.jupiter.api.parallel.Execution;
+import org.junit.jupiter.api.parallel.ExecutionMode;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.context.annotation.Import;
@@ -12,15 +14,13 @@
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
 
-@Import(DemoTestConfiguration.class)
-@WebMvcTest(DemoController.class)
+@IntegrationTest
+@Execution(ExecutionMode.CONCURRENT)
 public class DevModeIntrospectionTest {
-
     @Autowired
     private MockMvc mockMvc;
 
     @Test
-    @EnabledIfSystemProperty(named = "test-group", matches = "unit-test")
     public void shouldReturnInsecureIntrospectPayload() throws Exception {
         mockMvc.perform(get("/api/inngest").header("Host", "localhost:8080"))
             .andExpect(status().isOk())