5370d50932
Fixes https://github.com/spring-projects/spring-integration/issues/8773 The https://github.com/spring-projects/spring-integration/issues/8732 introduced a filtering for messages in group. So, plain `removeMessage()` doesn't work any more if message is connected to some group yet. Therefore, `DelayHandler` is failing. * Introduce `getMessageFromGroup()` and `removeMessageFromGroupById()` into `MessageGroupStore` API and implement it respectively in all the stores * Remove `@LongRunningTest` from delayer integration tests and adjust its config to delay not for a long **Cherry-pick to `6.1.x`**