[client-v2,jdbc-v2] Fix R2DBC tests with latest ClickHouse

[chernser]

Description

There are two tests in clickhouse-r2dbc project fails:

Error:  Failures: 
Error:    R2DBCTestKitImplTest.segmentInsertEmitsUpdateCount expectation "insert of a single row" failed (expected value: 1; actual value: 0)
Error:    R2DBCTestKitImplTest.transactionCommit expectation "rows inserted" failed (expected value: 1; actual value: 0)

This was found to be failing o the latest version of ClickHouse 26.2