Remove DevFatalErrorPage import when building

[Tobbe]

This lets us get rid of the commonjs plugin for Vite.
I went with the "alternative approach" from the description below

From initial description

This is the cause of a lot of issues with Webpack and Vite cross compatibility

Video description:
https://s.tape.sh/NZPq70HZ?s=1.25

We can use https://webpack.js.org/configuration/resolve/ and equivalent in vite to solve this.

i.e. do a normal import, but during build resolve it to null on both webpack and vite - so that its not included in the production build

Subtasks:

• Modify the CRWA template to import DevFatalErrorPage like normal

  import { DevFatalErrorPage as RedwoodDevFatalErrorPage } from '@redwoodjs/web/dist/components/DevFatalErrorPage'

• Configure webpack to not include the dev fatal error page during build
• Configure Vite to not include this page in the bundle during build
• Validate prerender
• Remove commonjs plugin from Vite

⚠️ Alternative approach

Use babel to set imports from @redwoodjs/web/dist/components/DevFatalErrorPage to an empty module somehow. This will work in all cases - Vite, Webpack and prerender

[dac09]

I would have kept the logic inside the plugin - as in always run the plugin, but the plugin doesn't do anything if its not in dev.

But just preference!