test: add slow proxy to next app for slow storyboard blocking playbac…#1288

cjpillsbury wants to merge 4 commits intomuxinc:mainmuxinc/elements:mainfrom

cjpillsbury:test/slow-storyboard-test-3.10.1cjpillsbury/elements:test/slow-storyboard-test-3.10.1Copy head branch name to clipboard