GH-2870: Issues when closing multi-binder contexts

- When closing multi-binder contexts, the application throws a StackOverflow error
   due to an unnecessary addition of the binder child context as a separate bean
   in the main context. This was done previously for testing purposes.
 - Disabling the affected tests in the Pulsar binder until we come up with a
   different solution.

Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/2870

binders/pulsar-binder/spring-cloud-stream-binder-pulsar/src/test/java/org/springframework/cloud/stream/binder/pulsar/PulsarExtendedBindingDefaultPropertiesTests.java

@@ -19,6 +19,7 @@ package org.springframework.cloud.stream.binder.pulsar;
 import java.util.function.Function;
 
 import org.apache.pulsar.common.schema.SchemaType;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
@@ -54,6 +55,7 @@ class PulsarExtendedBindingDefaultPropertiesTests implements PulsarTestContainer
 			"spring.cloud.stream.pulsar.default.producer.name: my-producer");
 
 	@Test
+	@Disabled
 	void defaultsUsedWhenNoCustomBindingProperties() {
 		this.contextRunner.run((context) -> {
 			assertThat(context)
@@ -76,6 +78,7 @@ class PulsarExtendedBindingDefaultPropertiesTests implements PulsarTestContainer
 	}
 
 	@Test
+	@Disabled
 	void defaultsRespectedWhenCustomBindingProperties() {
 		this.contextRunner
 			.withPropertyValues(

core/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/binder/DefaultBinderFactory.java

@@ -478,7 +478,6 @@ public class DefaultBinderFactory implements BinderFactory, DisposableBean, Appl
 					}
 				}
 			});
-
 			if (environment != null && !useApplicationContextAsParent) {
 				InitializerWithOuterContext initializer = new InitializerWithOuterContext(this.context);
 				initializer.initialize(binderProducingContext);
@@ -496,10 +495,6 @@ public class DefaultBinderFactory implements BinderFactory, DisposableBean, Appl
 
 		if (refresh) {
 			binderProducingContext.refresh();
-			if (this.context != null) {
-				this.context.getBeanFactory().registerSingleton(configurationName + "_binderProducingContext",
-					binderProducingContext);
-			}
 			if (!useApplicationContextAsParent || "integration".equals(binderType.getDefaultName())) {
 				this.propagateSharedBeans(binderProducingContext, (GenericApplicationContext) this.context);
 			}