Fix a couple flakey next-script and unoptimized image tests #37848
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The predefined scripts check seems to be unreliable as we are racing the scripts initializing so this removes them in favor of just checking that the expected scripts do execute. Also adds check for some image tests.
x-ref: https://github.com/vercel/next.js/runs/6966093715?check_suite_focus=true
x-ref: https://github.com/vercel/next.js/runs/6967524901?check_suite_focus=true
x-ref: https://github.com/vercel/next.js/runs/6964491610?check_suite_focus=true
x-ref: https://github.com/vercel/next.js/runs/6965566326?check_suite_focus=true