Fix Changesets config after dev console removal

[gonzaloriestra]

WHY are these changes introduced?

PR #8033 removed @shopify/ui-extensions-dev-console-app, but the deleted package remained in the Changesets fixed package group. This causes /snapit and other Changesets commands to fail while validating the configuration.

WHAT is this pull request doing?

Removes the stale @shopify/ui-extensions-dev-console-app entry from .changeset/config.json.

How to test your changes?

1. Run pnpm exec changeset status.
2. Confirm Changesets validates the configuration successfully.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add