fix(ci): Mark tests as flaky (#8430)

Author: PerfectSlayer

dd-java-agent/testing/src/main/groovy/datadog/trace/agent/test/base/HttpServerTest.groovy

@@ -1748,6 +1748,7 @@ abstract class HttpServerTest<SERVER> extends WithHttpServer<SERVER> {
     requestBodyNoStreaming ? IG_BODY_CONVERTED_HEADER : IG_BODY_END_BLOCK_HEADER
   }
 
+  @Flaky(value = "APPSEC-56822", suites = ["PlayScalaAsyncServerTest"])
   def 'user blocking'() {
     setup:
     assumeTrue(testUserBlocking())

dd-smoke-tests/custom-systemloader/src/test/groovy/datadog/smoketest/CustomSystemLoaderSmokeTest.groovy

@@ -1,5 +1,8 @@
 package datadog.smoketest
 
+import datadog.trace.test.util.Flaky
+import datadog.trace.test.util.Predicates.IBM
+
 import static java.util.concurrent.TimeUnit.SECONDS
 
 class CustomSystemLoaderSmokeTest extends AbstractSmokeTest {
@@ -27,6 +30,7 @@ class CustomSystemLoaderSmokeTest extends AbstractSmokeTest {
     return processBuilder
   }
 
+  @Flaky(value = 'Race condition with IMB. Check APMAPI-1194', condition = IBM)
   def "resource types loaded by custom system class-loader are transformed"() {
     when:
     testedProcess.waitFor(TIMEOUT_SECS, SECONDS)

utils/test-utils/src/main/groovy/datadog/trace/test/util/Predicates.java

@@ -7,14 +7,21 @@ public abstract class Predicates {
 
   private Predicates() {}
 
-  public static final class IBM8 implements Predicate<String> {
-    private static final String VENDOR_STRING = "IBM";
+  public static class IBM implements Predicate<String> {
+    private static final String IBM_VENDOR_STRING = "IBM";
+
+    @Override
+    public boolean test(String s) {
+      return System.getProperty("java.vendor", "").contains(IBM_VENDOR_STRING);
+    }
+  }
+
+  public static final class IBM8 extends IBM {
     private static final BigDecimal VERSION = new BigDecimal("1.8");
 
     @Override
     public boolean test(final String spec) {
-      final String vendor = System.getProperty("java.vendor", "");
-      if (!vendor.contains(VENDOR_STRING)) {
+      if (!super.test(spec)) {
         return false;
       }
       final BigDecimal version =