Update SitePage schema before onPreExtractQueries

[fusepilot]

Addresses #2685.

It looks like there was an attempt to fix this problem before judging by these lines:

gatsby/packages/gatsby/src/bootstrap/index.js

Lines 363 to 367 in 3691d65

	// Update Schema for SitePage.
	activity = report.activityTimer(`update schema`)
	activity.start()
	await require(`../schema`)()
	activity.end()

This PR simply moves that second require('../schema')() call to before onPreExtractQueries. And that seems to fix it.

Of course, I tried this after attempting to update the old schema in this branch. So thats started in case I've missed something and we need that in between "SitePage schema only" update.

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[KyleAMathews]

Hmm this makes SitePage queries work for you?

Yeah, probably we should just go with this and then do a slimmer schema update in the future so we're not recalculating everything.

[fusepilot]

This fixes the error message I was getting in #2685. And the allSitePage query I was testing against:

query IndexQuery {
    allSitePage {
      edges {
        node {
          fields {
            foo
          }
        }
      }
    }
  }

Is there another problem with SitePage queries that you were hoping to fix?

[KyleAMathews]

Nope! Let's try this out.

[jlengstorf]

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