IGNITE-24055 Sql. Update the observation timestamp only after processing DDL statements #5032
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https://issues.apache.org/jira/browse/IGNITE-24055
CatalogUtils.clusterWideEnsuredActivationTsSafeForRoReads. Otherwise these changes seem useless. The description of IGNITE-20378 looks outdated because it is about different clients, but at the moment the concept has changed and we guarantee the visibility of changes only within one client instance.testClientPropagatesLatestKnownHybridTimestamp(fromObservableTimestampPropagationTest) has been trimmed since the observable time is now updated inside the query execution, and an additional testddlExecutionUpdatesObservableTime(ExecutionServiceImplTest) has been added to verify this.