Fixes: #9481
Issue link: https://github.com/spring-projects/spring-integration/issues/9481
MySQL throws `CannotAcquireLockException` in case of duplicate key failure.
PostgreSQL just rollbacks a transaction not letting us move on with a `SELECT`
* Include `TransientDataAccessException` to the catch block of the `INSERT`
to ignore it for the subsequent `SELECT`
* Add logic to determine `PostgreSQL` database vendor and include `ON CONFLICT DO NOTHING`
hint into the `INSERT` to not fail in case of duplicate key found on `putIfAbsent` operation
**Auto-cherry-pick to `6.3.x` & `6.2.x`**
98d0266ba0