LPS-30899 Rename colliding friendly url for now (we should create an import validation framework for 7.0)
LPS-30899 Integration test
LPS-30899 Extract logic to a method (like in LayoutFriendlyURLStagedModelDataHandler) and change the name of the method to make more obvious that it's returning a unique friendlyURL or uniqueLayoutFriendlyURL
LPS-30899 SF
LPS-30360 SF