fix(appsync): correct schema definition for Query type

[azarboon]

Issue # (if applicable)

Closes #.

Reason for this change

The current schema is incorrect and it fails stack deployment. I got the following error:
AppStack | 14.47.29 | CREATE_FAILED | AWS::AppSync::Resolver | Api/QueryGetDemosConsistentResolver (ApiQueryGetDemosConsistentResolver47D5A89B) Resource handler returned message: "No field named getDemosConsistent found on type Query (Service: AppSync, Status Code: 404, Request ID: 49d05d60-ec48-484f-a5ea-ce4e07424291)" (RequestToken: 1776599b-8208-1445-0cfc-01cfb2bde3b1, HandlerErrorCode: NotFound) ❌ AppStack failed: Error: The stack named AppStack failed creation, it may need to be manually deleted from the AWS console: ROLLBACK_COMPLETE: Resource handler returned message: "No field named getDemosConsistent found on type Query (Service: AppSync, Status Code: 404, Request ID: 49d05d60-ec48-484f-a5ea-ce4e07424291)" (RequestToken: 1776599b-8208-1445-0cfc-01cfb2bde3b1, HandlerErrorCode: NotFound)

Description of changes

I had to change the schema.graphql as following to fix the bug and enable deployment:

type Demo {
  id: String!
  version: String!
}

type Query {
  getDemos: [Demo!]
  getDemosConsistent: [Demo!]  
}

input DemoInput {
  version: String!
}

type Mutation {
  addDemo(input: DemoInput!): Demo
}

Describe any new or updated permissions being added

<!— What new or updated IAM permissions are needed to support the changes being introduced ? -->

Description of how you validated changes

I locally tested it. Basically, the new update enabled me to deploy the example stack.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[azarboon]

Exemption Request

The code fails to deploy in its current state, preventing meaningful validation. Additionally, after reviewing the test files under the aws-appsync module, I couldn't find any tests specifically targeting schema.graphql. It appears schema validation isn't explicitly covered in the existing test suite.

Could you please consider exempting this change from mandatory test coverage, or guide me to any relevant test files if they do exist?

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b9fb7bc
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to a test file.
❌ Fixes must contain a change to an integration test file and the resulting snapshot.

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