add more e2e for route handlers in app-router

[sommeeeer]

This introduces more general E2E for all the different route handlers available. Let me know if I should include anything more in this PR.

It will test:

• All supported HTTP methods (GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS)
• That formData works in POST route handler
• That revalidation (ISR) works in GET route handler
• That you can cache a GET route with force-static
• That you can set cookies in a route handler
• That you should be able to redirect in a route handler
• Dynamic segments in a route handler
• Query parameters

Reference: https://nextjs.org/docs/app/building-your-application/routing/route-handlers

btw, i had to turn off this in biome.jsonc: https://biomejs.dev/linter/rules/use-literal-keys as it was not happy with using headers["allow"] or similar.

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[conico974]

LGTM Thanks a lot for that

[vicb]

Posting a FormData doesn't work for Cloudflare, posting an object is fine (as in the cookies test). Wondering why it works here?

[vicb]

nvm updating Playwright fixes this