User tasks don't disappear from the tasks list if there is a long service task after them

[haulmont-git]

If the user task is followed by the service task then when the user completes the task, the service task is started in the same transaction. There may be cases, however, when the service task is being executed for a long time. All this time the user task will be still in the list because its endDate field modification is not flushed to the database.

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Original issue: https://youtrack.haulmont.com/issue/PL-10495