MDEV-37810 Fixup spider test combinations

This is a fixup of 41725b4 where the
symlinks were incorrectly created using absolute paths.

Also fix ps protocol for spider/bugfix.mdev_29502,usual_handler

Author: mariadb-YuchenPei

storage/spider/mysql-test/spider/bg/combinations

@@ -0,0 +1,5 @@
+[group_by_handler]
+loose_spider_disable_group_by_handler=0
+
+[usual_handler]
+loose_spider_disable_group_by_handler=1

storage/spider/mysql-test/spider/bg/combinations

@@ -0,0 +1,5 @@
+[group_by_handler]
+loose_spider_disable_group_by_handler=0
+
+[usual_handler]
+loose_spider_disable_group_by_handler=1

storage/spider/mysql-test/spider/bugfix/combinations

@@ -21,6 +21,7 @@ set spider_direct_aggregate=1;
 
 eval CREATE TABLE t1 (a INT KEY) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "$srv",TABLE "t"';
 
+--disable_ps2_protocol
 SELECT MAX(a) FROM t1;
 SELECT SUM(a) FROM t1;
 SELECT COUNT(a) FROM t1;
@@ -32,6 +33,7 @@ SELECT COUNT(a), MAX(a), SUM(a) FROM t1;
 SELECT MAX(a), COUNT(a), SUM(a) FROM t1;
 SELECT MAX(a), MAX(COALESCE(a)) FROM t1;
 --enable_view_protocol
+--enable_ps2_protocol
 SHOW STATUS LIKE 'Spider_direct_aggregate';
 
 DROP TABLE t, t1;
@@ -41,7 +43,9 @@ INSERT INTO t VALUES (23, -1),(48, 97);
 
 eval CREATE TABLE t1 (a INT, b INT) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "$srv",TABLE "t"';
 
+--disable_ps2_protocol
 SELECT MAX(a + b), SUM(a - b) FROM t1;
+--enable_ps2_protocol
 SHOW STATUS LIKE 'Spider_direct_aggregate';
 
 DROP TABLE t, t1;

storage/spider/mysql-test/spider/bugfix/combinations

@@ -0,0 +1,5 @@
+[group_by_handler]
+loose_spider_disable_group_by_handler=0
+
+[usual_handler]
+loose_spider_disable_group_by_handler=1

storage/spider/mysql-test/spider/bugfix/t/mdev_29502.test

@@ -0,0 +1,5 @@
+[group_by_handler]
+loose_spider_disable_group_by_handler=0
+
+[usual_handler]
+loose_spider_disable_group_by_handler=1