chore(dx): Improve errors and warnings during Cell prerendering

[dac09]

What does this PR do?

• Better error when there's a routeHook error
  

• Better error when using a a protected query in a cell that is being prerendered
  

• Only warn when graphql function has been moved, and fallback to Loading state for Cells

• Better logging of whats been prerendered
• Make sure output of prerender during rw build is preserved
  
• Updates prerender docs with examples and better organisation of concepts

Closes #6201

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[dac09]

Fair comment. I'll rename!

[dac09]

@Tobbe any thoughts on how we could add additional tests jest tests to prevent regression on this behaviour?

I'm guessing we have to wrap a cell in the provider and render it after giving it a value?

[Tobbe]

@dac09 I added to our smoke tests when I added cell prerendering. Maybe add something there that's testing protected queries?

Can we add jest tests for the runPrerender method? If we could, we could mock path.join() to return a broken path to the graphql file, and test that it prerenders the loading state

[dac09]

Nah - the runPrerender is too involved, and need webpack, etc. to do it.

I was thinking more if we could add unit tests that checks the “prerendered” behaviour of createCell (so just in the react world. without all other stuff)

[Tobbe]

Ohh, yeah, that'd be pretty easy. Just prep the context with the required data.
You should be able to explicitly call createCell in a component, render that with that global PRERENDERING flag set and then expect on screen

[dac09]

I won't do it in this PR, because I think we need tests for this anyway, but I'll keep it on my list for later