TestStepImport may map incorrect IDs due to ManualTestStepsChangeEvent

TestStepImport may map incorrect step ids due to the event.

This event is caught by a listener which fixes the step indexes/ranks.

The TestStepImport creates one step at a time and there is no guarantee that it receives the steps ordered by index. Each time a step is created, the event is thrown.

If the TestStepImport creates, in the first place, a step with index 3. The event listener will fix the index, setting it to 1. This leads to steps in incorrect index, which leads to incorrect step id mappings.