Update modification details when speed limit is split
Modify existing speed limit end point when splitting one link speed limit after speed limit middle point
Modify existing speed limit start point when splitting one link speed limit before speed limit middle point
Create new speed limit to backend when splitting speed limit
Add start and end measures to a newly created speed limit in speed limit split
Extract common assertions into shared function
Assert that speed limit is created for the first split of speed limit link when splitting one link speed limit before limit middle point
Fix function return value
Handle speed limit links parameter in tests