JIRA: https://jira.spring.io/browse/INT-3999
Since the scheduled tasks may live for a long time it can finish
with the `OutOfMemory` if we use the direct reference to big objects, like `Message<?>`.
* Fix `AbstractCorrelatingMessageHandler` to deal only with the `groupId`
from the `scheduleGroupToForceComplete()` when we `schedule` `Runnable` for the `forceRelease` logic.
* Fix `DelayHandler` to deal only with `messageId` in the `releaseMessageAfterDelay()`, when we
`schedule` `Runnable` for the `releaseMessageAfterDelay`.
* Since the logic hasn't been changed for those components, there is no any new test.
There is just enough to be sure that all existing tests are fine.
**Cherry-pick to 4.0.x, 4.1.x, 4.2.x**
Optimise the release task for the `SimpleMessageStore` case
256a7292ef