Fixes https://github.com/spring-projects/spring-integration/issues/3445
The `JdbcLockRegistry` improperly unlock the delegate (a `ReentrantLock`)
in the case of `TransientDataAccessException` or a `TransactionTimedOutException` is thrown.
As this occurs in a while loop, the next time the delegate is unlocked,
it not longer as a owner thread and throws an `IllegalMonitorStateException`.
* Move `delegate.unlock()` outside the while loop in the `JdbcLock.unlock()` method
* Add `JdbcLockRegistryDelegateTests` for mocked `LockRepository` to add more coverage
for `JdbcLockRegistry` functionality
**Cherry-pick to 5.4.x, 5.3.x & 5.2.x**
(cherry picked from commit 7e66509682)
a79c245cac