fix(appsync): source api association does not depend on schema

[go-to-k]

Issue # (if applicable)

Closes #29044.

Reason for this change

When associating between the source GraphQL API and the merged API using fromSourceApis, generated association resource doesn't depend on the source GraphQL schema.

// This API has `CfnGraphQLSchema` by `definition` prop
const firstApi = new appsync.GraphqlApi(stack, 'FirstSourceAPI', {
  name: 'FirstSourceAPI',
  definition: appsync.Definition.fromFile(path.join(__dirname, 'appsync.merged-api-1.graphql')),
});

// This merged API generates `CfnSourceApiAssociation`
new appsync.GraphqlApi(stack, 'MergedAPI', {
  name: 'MergedAPI',
  definition: appsync.Definition.fromSourceApis({
    sourceApis: [
      {
        sourceApi: firstApi,
        mergeType: appsync.MergeType.MANUAL_MERGE,
      },
    ],
  }),
});

The same is true if the SourceApiAssociation construct is used explicitly.

// This API has `CfnGraphQLSchema` by `definition` prop
const firstApi = new appsync.GraphqlApi(stack, 'FirstSourceAPI', {
  name: 'FirstSourceAPI',
  definition: appsync.Definition.fromFile(path.join(__dirname, 'appsync.merged-api-1.graphql')),
});

// This merged API does not generate `CfnSourceApiAssociation`
const mergedApi = new appsync.GraphqlApi(stack, 'MergedAPI', {
  name: 'MergedAPI',
  definition: appsync.Definition.fromSourceApis({
    sourceApis: [],
    mergedApiExecutionRole: mergedApiExecutionRole,
  }),
});

// This construct has `CfnSourceApiAssociation`
new appsync.SourceApiAssociation(stack, 'SourceApiAssociation1', {
  sourceApi: firstApi,
  mergedApi: mergedApi,
  mergeType: appsync.MergeType.MANUAL_MERGE,
  mergedApiExecutionRole: mergedApiExecutionRole,
});

Description of changes

The sourceApi passed by the fromSourceApis method or the SourceApiAssociation construct has addSchemaDependency method. Using this method, we can make the association to depend on the schema in the sourceApi.
But, if the api is an IMPORTED resource to begin with, it has no schema in the CDK layer, so there is nothing we can do about it. (The method does nothing.)

Description of how you validated changes

Both unit and existing integ tests.

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

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[go-to-k]

Exemption Request: This change could be covered by unit tests and the existing integ tests.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 66755a7
• Result: SUCCEEDED
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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #29455. Mergify cannot evaluate rules on this PR. ⚠️