Add GraphQL reference for Adobe Commerce v2.4.9

[dshevtsov]

Purpose of this pull request

This pull request updates the Commerce Web API documentation site so the GraphQL reference reflects Adobe Commerce 2.4.9 as a released version (replacing the 2.4.9-beta-1 paths and labels), pins the 2.4.8 reference to its own SpectaQL-generated static bundle under /graphql-api/2.4.8/, and regenerates SpectaQL schema and static HTML so the embedded reference matches the current schemas. It also aligns the build:spectaql npm script with the 2.4.8 config.

Affected pages

• https://developer.adobe.com/commerce/webapi/graphql/reference
• https://developer.adobe.com/commerce/webapi/reference/graphql/2.4.9
• https://developer.adobe.com/commerce/webapi/reference/graphql/2.4.8

Embedded SpectaQL output (iframes from frameSrc):

• https://developer.adobe.com/commerce/webapi/graphql-api/index.html (2.4.9 reference)
• https://developer.adobe.com/commerce/webapi/graphql-api/2.4.8/index.html (2.4.8 reference)

Preview

• https://adobedocs.github.io/commerce-webapi/reference/graphql/2.4.9/

Links to Magento Open Source code

Additional information

• Add major-update label

What's New highlights

whatsnew
Published the GraphQL API reference for Adobe Commerce 2.4.9 and updated the GraphQL API reference landing page, navigation, and embedded SpectaQL documentation; the 2.4.8 GraphQL API reference now loads the version-specific documentation under /graphql-api/2.4.8/.