Refactor HttpAPIClientHelper to improve response cleanup handling. Bring back in-place response cleanup

Author: aleksei-griaznov

client-v2/src/main/java/com/clickhouse/client/api/internal/HttpAPIClientHelper.java

@@ -454,9 +454,14 @@ public ClassicHttpResponse executeRequest(Endpoint server, Map<String, Object> r
             if (httpResponse.getCode() == HttpStatus.SC_PROXY_AUTHENTICATION_REQUIRED) {
                 throw new ClientMisconfigurationException("Proxy authentication required. Please check your proxy settings.");
             } else if (httpResponse.getCode() == HttpStatus.SC_BAD_GATEWAY) {
+                httpResponse.close();
                 throw new ClientException("Server returned '502 Bad gateway'. Check network and proxy settings.");
             } else if (httpResponse.getCode() >= HttpStatus.SC_BAD_REQUEST || httpResponse.containsHeader(ClickHouseHttpProto.HEADER_EXCEPTION_CODE)) {
-                throw readError(httpResponse);
+                try {
+                    throw readError(httpResponse);
+                } finally {
+                    httpResponse.close();
+                }
             }
             return httpResponse;