Fix overly generic name in with.sql test.

Avoid the name "test".  In the 10 branch, this could clash with
alter_table.sql, as seen in the build farm.  That other instance was
already renamed in later branches by commit 2cf8c7aa, but it's good to
future-proof the name here too.

Back-patch to 10.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKGJf4RAXUyAYVUcQawcptX%3DnhEco3SYpuPK5cCbA-F1eLA%40mail.gmail.com

src/test/regress/expected/with.out

@@ -3118,19 +3118,19 @@ with ordinality as (select 1 as x) select * from ordinality;
 (1 row)
 
 -- check sane response to attempt to modify CTE relation
-WITH test AS (SELECT 42) INSERT INTO test VALUES (1);
-ERROR:  relation "test" does not exist
-LINE 1: WITH test AS (SELECT 42) INSERT INTO test VALUES (1);
+WITH with_test AS (SELECT 42) INSERT INTO with_test VALUES (1);
+ERROR:  relation "with_test" does not exist
+LINE 1: WITH with_test AS (SELECT 42) INSERT INTO with_test VALUES (...
                                                   ^
 -- check response to attempt to modify table with same name as a CTE (perhaps
 -- surprisingly it works, because CTEs don't hide tables from data-modifying
 -- statements)
-create temp table test (i int);
-with test as (select 42) insert into test select * from test;
-select * from test;
+create temp table with_test (i int);
+with with_test as (select 42) insert into with_test select * from with_test;
+select * from with_test;
  i  
 ----
  42
 (1 row)
 
-drop table test;
+drop table with_test;

src/test/regress/sql/with.sql

@@ -1451,12 +1451,12 @@ create table foo (with ordinality);  -- fail, WITH is a reserved word
 with ordinality as (select 1 as x) select * from ordinality;
 
 -- check sane response to attempt to modify CTE relation
-WITH test AS (SELECT 42) INSERT INTO test VALUES (1);
+WITH with_test AS (SELECT 42) INSERT INTO with_test VALUES (1);
 
 -- check response to attempt to modify table with same name as a CTE (perhaps
 -- surprisingly it works, because CTEs don't hide tables from data-modifying
 -- statements)
-create temp table test (i int);
-with test as (select 42) insert into test select * from test;
-select * from test;
-drop table test;
+create temp table with_test (i int);
+with with_test as (select 42) insert into with_test select * from with_test;
+select * from with_test;
+drop table with_test;