fixed exececutor negative task duration

[Nataneljpwd]

Any executor may cause a negative duration of a task

This PR fixes an issue, where if a task's state is changed externally (which sets a task's end_data), while the task was either starting to run or already in the queue of the executor, it would still set the start_date, this makes sure we skip the task run, along with skipping all checks, while not allowing for negative runtime, and saving compute in k8s executor.

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