Remove unneeded files for editor test

Per talking with team, unneeded

build.py

 # Prepare an empty project for editor tests
 def prepare_editor_test_project(repo_path, project_path, logger):
     copy_path_to_project("ImageTemplates", repo_path, project_path, logger)
-    copy_path_to_project("SampleScenes", repo_path, project_path, logger)
-    copy_path_to_project("TestbedPipelines", repo_path, project_path, logger)
     copy_path_to_project("Tests", repo_path, project_path, logger)