fix(tests): optimized images (size:512x512 & compression)

frontend/static/surveys/items/1000/1.jpeg

frontend/static/surveys/items/1000/2.jpeg

frontend/static/surveys/items/1000/3.jpeg

frontend/static/surveys/items/1000/4.jpeg

frontend/static/surveys/items/1001/1.jpeg

frontend/static/surveys/items/1001/2.jpeg

frontend/static/surveys/items/1001/3.jpeg

frontend/static/surveys/items/1001/4.jpeg

frontend/static/surveys/items/1002/1.jpeg

frontend/static/surveys/items/1002/2.jpeg

frontend/static/surveys/items/1002/3.jpeg

frontend/static/surveys/items/1002/4.jpeg

frontend/static/surveys/items/1003/1.jpeg

frontend/static/surveys/items/1003/2.jpeg

frontend/static/surveys/items/1003/3.jpeg

frontend/static/surveys/items/1003/4.jpeg

frontend/static/surveys/items/1004/1.jpeg

frontend/static/surveys/items/1004/2.jpeg

frontend/static/surveys/items/1004/3.jpeg

frontend/static/surveys/items/1004/4.jpeg