ReactorNettyClientResponse should close response body

This commit ensures that the response body is drained and closed when
the response itself is closed, instead of disposing the connection, as
this will disable the connection pool.

Closes gh-32528

Author: poutsma

spring-web/src/main/java/org/springframework/http/client/ReactorNettyClientResponse.java

@@ -27,6 +27,7 @@
 import org.springframework.http.HttpStatusCode;
 import org.springframework.http.support.Netty4HeadersAdapter;
 import org.springframework.lang.Nullable;
+import org.springframework.util.StreamUtils;
 
 /**
  * {@link ClientHttpResponse} implementation for the Reactor-Netty HTTP client.
@@ -89,7 +90,13 @@ public InputStream getBody() throws IOException {
 
 	@Override
 	public void close() {
-		this.connection.dispose();
+		try{
+			InputStream body = getBody();
+			StreamUtils.drain(body);
+			body.close();
+		}
+		catch (IOException ignored) {
+		}
 	}
 
 }