[gatsby-node] Fix GraphQL query error for slug field on Frontmatter type

[Copilot]

Description

This PR fixes the GraphQL build error where gatsby-redirect-from plugin queries the slug field on Frontmatter type, which was not defined in the schema.

Cannot query field "slug" on type "Frontmatter".

If you don't expect "slug" to exist on the type "Frontmatter" it is most likely a typo. However, if you expect "slug" to exist there are a couple of solutions to common problems:

- If you added a new data source and/or changed something inside gatsby-node/gatsby-config, please try a restart of your development server.
- You want to optionally use your field "slug" and right now it is not used anywhere.

It is recommended to explicitly type your GraphQL schema if you want to use optional fields.

Changes:

• Add slug: String to the Frontmatter type definition in createSchemaCustomization in gatsby-node.js

Notes for Reviewers

The gatsby-redirect-from plugin queries frontmatter { slug } to support redirect functionality. This optional field needed to be explicitly typed in the GraphQL schema to prevent build errors.

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Fix the following build error:

info Writing GraphQL type definitions to /home/runner/work/layer5/layer5/.cache/schema.gql
success building schema - 1.725s
error There was an error in your GraphQL query:

Cannot query field "slug" on type "Frontmatter".

If you don't expect "slug" to exist on the type "Frontmatter" it is most likely a typo. However, if you expect "slug" to exist there are a couple of solutions to common problems:

- If you added a new data source and/or changed something inside gatsby-node/gatsby-config, please try a restart of your development server.
- You want to optionally use your field "slug" and right now it is not used anywhere.

It is recommended to explicitly type your GraphQL schema if you want to use optional fields.
not finished createPages - 0.016s
Error: Process completed with exit code 1.

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Fixed in 3632986. The build error was caused by the gatsby-redirect-from plugin querying frontmatter { slug }, but this field wasn't defined in the schema. Added slug: String to the Frontmatter type definition in gatsby-node.js.