[SPARK-29825][SQL][TESTS] Add join-related configs in `inner-join.sql…

…` and `postgreSQL/join.sql`

### What changes were proposed in this pull request?

For better test coverage, this pr is to add join-related configs in `inner-join.sql` and `postgreSQL/join.sql`. These join related configs were just copied from ones in the other join-related tests in `SQLQueryTestSuite` (e.g., https://github.com/apache/spark/blob/master/sql/core/src/test/resources/sql-tests/inputs/natural-join.sql#L2-L4).

### Why are the changes needed?

Better test coverage.

### Does this PR introduce any user-facing change?

No.

### How was this patch tested?

Existing tests.

Closes #26459 from maropu/AddJoinConds.

Authored-by: Takeshi Yamamuro <yamamuro@apache.org>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

sql/core/src/test/resources/sql-tests/inputs/inner-join.sql

@@ -1,3 +1,8 @@
+-- List of configuration the test suite is run against:
+--SET spark.sql.autoBroadcastJoinThreshold=10485760
+--SET spark.sql.autoBroadcastJoinThreshold=-1,spark.sql.join.preferSortMergeJoin=true
+--SET spark.sql.autoBroadcastJoinThreshold=-1,spark.sql.join.preferSortMergeJoin=false
+
 CREATE TEMPORARY VIEW t1 AS SELECT * FROM VALUES (1) AS GROUPING(a);
 CREATE TEMPORARY VIEW t2 AS SELECT * FROM VALUES (1) AS GROUPING(a);
 CREATE TEMPORARY VIEW t3 AS SELECT * FROM VALUES (1), (1) AS GROUPING(a);

sql/core/src/test/resources/sql-tests/inputs/postgreSQL/join.sql

@@ -6,6 +6,12 @@
 -- Test JOIN clauses
 -- https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/join.sql
 --
+
+-- List of configuration the test suite is run against:
+--SET spark.sql.autoBroadcastJoinThreshold=10485760
+--SET spark.sql.autoBroadcastJoinThreshold=-1,spark.sql.join.preferSortMergeJoin=true
+--SET spark.sql.autoBroadcastJoinThreshold=-1,spark.sql.join.preferSortMergeJoin=false
+
 CREATE OR REPLACE TEMPORARY VIEW INT4_TBL AS SELECT * FROM
   (VALUES (0), (123456), (-123456), (2147483647), (-2147483647))
   AS v(f1);