MDEV-22119: main.innodb_ext_key fails sporadically

Made the test stable by adding more rows so the range scan is cheaper than table scan.

Author: Varun Gupta

mysql-test/main/innodb_ext_key.result

@@ -970,6 +970,10 @@ INSERT INTO t2 VALUES
 (547118223,998,0,NULL,4,'','',0,0,NULL,NULL,''),(547119246,998,0,NULL,5,'','',0,0,NULL,NULL,''),
 (547115155,999,0,NULL,1,'','',0,0,NULL,NULL,''),(547116178,999,0,NULL,2,'','',0,0,NULL,NULL,''),
 (547117201,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547118224,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117213,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117217,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117214,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117218,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117215,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117219,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117216,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117220,999,0,NULL,4,'','',0,0,NULL,NULL,''),
 (547119271,38928081,0,NULL,10,'','',0,0,NULL,NULL,''),(547119272,38928081,0,NULL,11,'','',0,0,NULL,NULL,''),
 (547119273,38928081,0,NULL,12,'','',0,0,NULL,NULL,''),(547119274,38928081,0,NULL,13,'','',0,0,NULL,NULL,''),
 (547119275,38928081,0,NULL,14,'','',0,0,NULL,NULL,''),(547119276,38928081,0,NULL,15,'','',0,0,NULL,NULL,''),

mysql-test/main/innodb_ext_key.test

@@ -618,6 +618,10 @@ INSERT INTO t2 VALUES
 (547118223,998,0,NULL,4,'','',0,0,NULL,NULL,''),(547119246,998,0,NULL,5,'','',0,0,NULL,NULL,''),
 (547115155,999,0,NULL,1,'','',0,0,NULL,NULL,''),(547116178,999,0,NULL,2,'','',0,0,NULL,NULL,''),
 (547117201,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547118224,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117213,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117217,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117214,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117218,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117215,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117219,999,0,NULL,4,'','',0,0,NULL,NULL,''),
+(547117216,999,0,NULL,3,'','',0,0,NULL,NULL,''),(547117220,999,0,NULL,4,'','',0,0,NULL,NULL,''),
 (547119271,38928081,0,NULL,10,'','',0,0,NULL,NULL,''),(547119272,38928081,0,NULL,11,'','',0,0,NULL,NULL,''),
 (547119273,38928081,0,NULL,12,'','',0,0,NULL,NULL,''),(547119274,38928081,0,NULL,13,'','',0,0,NULL,NULL,''),
 (547119275,38928081,0,NULL,14,'','',0,0,NULL,NULL,''),(547119276,38928081,0,NULL,15,'','',0,0,NULL,NULL,''),