[SPARK-54638][SQL][TEST] Reuse statement instances if possible in SparkConnectJdbcDataTypeSuite

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

Improve `SparkConnectJdbcDataTypeSuite` to reuse the statement instances in `withExecuteQuery` if possible

### Why are the changes needed?

use less resources in tests

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

no

### How was this patch tested?

existing tests

### Was this patch authored or co-authored using generative AI tooling?

cursor 2.1.50

Closes #53385 from cloud-fan/test.

Lead-authored-by: Wenchen Fan <wenchen@databricks.com>
Co-authored-by: Wenchen Fan <cloud0fan@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
(cherry picked from commit ce9dcab)
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

Author: cloud-fan