code: @GetMapping
    public String viewMappingProjects(Model model) {
      model.addAttribute("mappingProjects", mappingService.getAllMappingProjects());
      model.addAttribute("entityTypes", getWritableEntityTypes());
      model.addAttribute("user", getCurrentUsername());
      model.addAttribute("admin", currentUserIsSu());
      model.addAttribute(
          "importerUri", menuReaderService.findMenuItemPath(ImportWizardController.ID));
      return VIEW_MAPPING_PROJECTS;
    }
docs: Initializes the model with all mapping projects and all entities to the model.
  
  @param model the model to initialized
  @return view name of the mapping projects list