_exec_script() close fd and reset signal

+ somes more adjustements in _exec_script()
+ rough notes for non blocking CGI

srcs/webserv/run_loop.cpp

@@ -62,6 +62,11 @@ void	Webserv::run()
 				std::vector<Client>().swap(_clients);
 				break;
 			}
+			catch (const Webserv::ExecFail& e)
+			{
+				std::cerr << e.what() << '\n';
+				throw;
+			}
 			catch (const std::exception& e) {
 				std::cerr << e.what() << '\n';
 				++i;