Print Redbox content if `assertNoRedbox` fails #6841

Job	Run time
build-wasm (web)	21s
build	2m 0s
build-wasm (nodejs)	18s
deploy-target	8s
stable - x86_64-apple-darwin - node@16	57s
stable - aarch64-apple-darwin - node@16	57s
stable - aarch64-pc-windows-msvc - node@16	2m 51s
stable - x86_64-unknown-linux-gnu - node@16	1m 44s
stable - aarch64-unknown-linux-gnu - node@16	1m 58s
Deploy examples	0s
Deploy preview tarball	2m 3s
Potentially publish release	0s
Upload Turbopack Bytesize metrics to Datadog	0s
Release Stats	0s
	13m 17s

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