fix(drt): scheduling a same-index insertion before a prebooked request #3111
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There has been a bug when scheduling an insertion that has the same pickup and dropoff index (new dropoff directly following the new pickup along the stop sequence) just before a task with a prebooked pick-up. In that case, the begin time of the following pick-up task was illegally shifted to the past, or otherwise put, the fixed begin time of the prebooked task was not kept constant, thus blocking the vehicle for an unnecessary long time in a stop task. This PR fixes this issue, the performance of the prebooking scenario improves in the tests.