[SPARK-30913][SPARK-30841][CORE][SQL][FOLLOWUP] Supplement version information to the configuration of Tests.scala and SQL

### What changes were proposed in this pull request?
I checked all the config of Spark again. find some new commit not add version information.

**Test.scala**
Item name | Since version | JIRA ID | Commit ID | Note
-- | -- | -- | -- | --
spark.testing.skipValidateCores | 3.1.0 | SPARK-29154 | 474b1bb#diff-8b4ea8f3b0cc1e7ce7e943de1abbb165 |  

**SQL**
Item name | Since version | JIRA ID | Commit ID | Note
-- | -- | -- | -- | --
spark.sql.legacy.integerGroupingId | 3.1.0 | SPARK-30279 | 71c73d5#diff-9a6b543db706f1a90f790783d6930a13 |  

The two config only exists in branch master.

### Why are the changes needed?
Supplement version information.

### Does this PR introduce any user-facing change?
'No'.

### How was this patch tested?
Jenkins test.

Closes apache#28233 from beliefer/sql-conf-version-legacy-integerGroupingId.

Authored-by: beliefer <[email protected]>
Signed-off-by: HyukjinKwon <[email protected]>

Author: beliefer

core/src/main/scala/org/apache/spark/internal/config/Tests.scala

@@ -79,6 +79,7 @@ private[spark] object Tests {
   // on the host.
   val SKIP_VALIDATE_CORES_TESTING =
     ConfigBuilder("spark.testing.skipValidateCores")
+      .version("3.1.0")
       .booleanConf
       .createWithDefault(false)
 

sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala

@@ -2519,6 +2519,7 @@ object SQLConf {
     buildConf("spark.sql.legacy.integerGroupingId")
       .internal()
       .doc("When true, grouping_id() returns int values instead of long values.")
+      .version("3.1.0")
       .booleanConf
       .createWithDefault(false)