static nitro builds when running nuxi generate #21254
Description
Now that we have support for nitro 'static' builds it would be nice to enable this behaviour automatically when running nuxi generate.
### Tasks
- [x] detect `netlify-static` and `vercel-static` environments automatically (upstream bug in nitro)
- [x] normalise behaviour between `build` and `generate` when using a static preset (prerender configuration, crawler, etc.)
Linked issues: