Fix Playwright hanging in Node 20.5.2+

[markdalgleish]

This reverts #11440 and remix-run/remix#9000 (in this repo).

Since moving to pnpm, we've had issues with Playwright tests hanging in Node 20.5.2+. I was able to narrow it down to workspace package imports being the cause. With pnpm, our built code no longer resides in a node_modules directory but is linked to the packages directory instead which means that Playwright no longer treats it as external. If we mark the packages dir as external, the tests don't hang anymore.

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