[SPARK-29687][SQL] Fix JDBC metrics counter data type

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

Fix JDBC metrics counter data type. Related pull request [26109](apache#26109).

### Why are the changes needed?

Avoid overflow.

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

No.

### How was this patch tested?

Exists UT.

Closes apache#26346 from ulysses-you/SPARK-29687.

Authored-by: ulysses <[email protected]>
Signed-off-by: Takeshi Yamamuro <[email protected]>

Author: ulysses-you

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala

@@ -652,7 +652,7 @@ object JdbcUtils extends Logging {
       }
     }
     val supportsTransactions = finalIsolationLevel != Connection.TRANSACTION_NONE
-    var totalRowCount = 0
+    var totalRowCount = 0L
     try {
       if (supportsTransactions) {
         conn.setAutoCommit(false) // Everything in the same db transaction.