[PECOBLR-530] Fix leak in preparedStatement + fix interpolation in metadata

[samikshya-db]

Description

This PR does 2 things :

1. Closes the describe query statement in preparedStatement (fix the leak)
2. Fixes the errors when sql does not have parameters defined (Otherwise a parsing error is thrown from the backend). For example Describe select ? fails whereas Describe select '?' passes

Testing

• The leakage in our driver is fixed after this code change. Verified by using a serverless warehouse I created on dogfood samikshya-test-small-warehouse. The warehouse closes within 5 minutes (which is the timeout I have set too)

Code used :

Connection connection = DriverManager.getConnection(JDBC_URL, USERNAME, PASSWORD);
PreparedStatement preparedStatement = connection.prepareStatement("select 1");
ResultSetMetaData rs= preparedStatement.getMetaData();

Additional Notes to the Reviewer

• The integration tests are failing because of a known issue orthogonal to this, will be fixed by the team in subsequent PRs.
• Merging this as we had done the review as part of [PECOBLR-530] Fix leak in preparedStatement + fix interpolation in metadata #847 (This PR got closed as a result of OSS processes.)

[samikshya-db]

Merging this as we had done the review as part of #847 (This PR got closed as a result of OSS processes.)