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Fix a couple of task thread-safety issues
1) OperationResult is not a thread-safe structure, yet it was exposed to multiple threads - mainly in getUpdatedOrClonedTaskObject method. 2) Even backing task prism objects were exposed to multiple threads in a special case: When a task with running LATs was fetched (with an option to retrieve also subtasks), live instances of prism objects were returned. If they were later processed - e.g. serialized in GUI - concurrency-related exceptions could occur. All of this should be now fixed, along with better naming for methods that give access to backing task prism object. A price to pay is that the operation result in returned objects is not updated in these cases. But it should be acceptable. This should resolve MID-6910.
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