* GH-3282: Fix JdbcMetadataStore for DuplicateKeyEx
Fixes: https://github.com/spring-projects/spring-integration/issues/3282
The `INSERT INTO ... SELECT ... FROM ... HAVING` may fail with
`DuplicateKeyException` in between transactions.
* Catch `DuplicateKeyException` from in the `tryToPutIfAbsent()`
and return `0` as a fact of not inserted to let other logic to work
as expected.
There is no test coverage for this since it is almost impossible to
reproduce such a race condition on DB
**Cherry-pick to 5.3.x & 5.2.x**
* * Remove misleading message in the comment sentence
665f6bfb69