Refine BlockHound support

- disable for Java 14/15 for now until BlockHound support
- targeted installation of required integrations only

Author: rstoyanchev

spring-core/src/test/java/org/springframework/core/SpringCoreBlockHoundIntegrationTests.java

@@ -21,27 +21,34 @@
 
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledForJreRange;
 import reactor.blockhound.BlockHound;
+import reactor.core.scheduler.ReactorBlockHoundIntegration;
 import reactor.core.scheduler.Schedulers;
 
 import org.springframework.tests.sample.objects.TestObject;
 import org.springframework.util.ConcurrentReferenceHashMap;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.condition.JRE.JAVA_14;
 
 /**
  * Tests to verify the spring-core BlockHound integration rules.
  *
  * @author Rossen Stoyanchev
  * @since 5.2.4
  */
+@DisabledForJreRange(min = JAVA_14)
 public class SpringCoreBlockHoundIntegrationTests {
 
 
 	@BeforeAll
 	static void setUp() {
-		BlockHound.install();
+		BlockHound.builder()
+				.with(new ReactorBlockHoundIntegration()) // Reactor non-blocking thread predicate
+				.with(new ReactiveAdapterRegistry.SpringCoreBlockHoundIntegration())
+				.install();
 	}