feat: cdn cache control support

[pieh]

Description

This explores using CDN Cache Control headers in next-runtime. Those are alternative to ODBs. This Pull Request contains changes from following PRs:

• fix: add text/x-component header to .rsc assets generated at build time, don't use rsc-data edge function when hitting .rsc path directly
• test: setup cypress test running for variant of default demo with all flags enabled

So it might be worth checking only last commit in this PR for just CDN Cache Control related changes

Things that are done here:

• introduction of feature flag for cdn cache control
• if that flag is enabled:
  • don't generate ODB handler at all, and all rewrites that previously would point to odb now point to ssr handler as it handle both SSR and ISR pages in this setup
  • setting up netlify-cdn-cache-control header to re-use value of cache-control header provided by Next.js, setting x-nf-vary from vary header provided by Next.js (syntax of value of those headers is different, so there is some manipulation of value going on)
  • rsc-data middleware is no longer used for RSC request if it is handled by lambda (we still need it for .rsc files that are produced at build time - we would need header conditions for rewrites to be able to get rid of it completely)

Things not yet done:

• testing behavior related to i18n
• implementation of on-demand isr revalidation (required APIs are not yet available)

Documentation

Tests

You can test this change yourself like so:

1. TODO

Relevant links (GitHub issues, etc.) or a picture of cute animal

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[serhalp]

Superseded by v5.