[improvement][launcher]Clean code logic of s2demos and remove tag-related constructs.

launchers/standalone/src/main/resources/db/schema-mysql-demo.sql

@@ -1,3 +1,4 @@
+-------S2VisitsDemo
 CREATE TABLE IF NOT EXISTS `s2_user_department` (
       `user_name` varchar(200) NOT NULL,
        `department` varchar(200) NOT NULL
@@ -26,7 +27,7 @@ CREATE TABLE IF NOT EXISTS `singer` (
     `favor_cnt` bigint DEFAULT NULL
 )ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- benchmark
+-------S2ArtistDemo
 CREATE TABLE IF NOT EXISTS `genre` (
     `g_name` varchar(20) NOT NULL , -- genre name
     `rating` INT ,