reorganize gatsby related file structure

[interim17]

Problem

Housekeeping. Moving things into this structure:

/gatsby
   constants.js
   /schema
      .gql files
  /utils
     .resolvers etc.

I tried moving gastby-node and gatsby-config in there and exporting those files from the root but it seemed annoying.
Gatsby expects those at the project root so I just left them there for now,

[Copilot]

Pull request overview

This PR reorganizes the Gatsby-related file structure by consolidating files into a clearer directory hierarchy under /gatsby, with subdirectories for /utils, /schema, and a constants.js file. The primary purpose is housekeeping to improve code organization and maintainability.

Changes:

• Moved constants from gatsbyutils/constants to gatsby/constants
• Moved resolver utilities from gatsbyutils/ to gatsby/utils/
• Updated import paths throughout the codebase to reflect the new structure

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
gatsby/utils/test/gatsby-resolver-utils.test.js	Updated import path for constants to match new directory structure
gatsby/utils/gatsby-resolver-utils.js	Updated require path for constants to match new directory structure
gatsby-node.js	Updated require paths for resolver utils and constants to match new directory structure

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