Fixes https://github.com/spring-projects/spring-integration/issues/2753 * Remove Guava dependency and its minor functionality from the `StoredProcExecutor` * Remove `@ManagedResource` and its operations/attributes from `StoredProcExecutor` since they are not relevant any more * Remove tests related to JMX and Guava * Refactor all other tests in the affected classes * Some code polishing in the `StoredProcExecutor`