fix(amplify-alpha): removing customResponseHeaders property does not remove the headers from the app

[georeeve]

Issue # (if applicable)

Closes #31783.

Reason for this change

After setting the customResponseHeaders property to some value in the App construct, removing it again does not remove the headers in the Amplify console.

Description of changes

I have set the customHeaders property to a default value of an empty string. This sets the relevant CloudFormation property when customResponseHeaders is not provided, therefore overriding any previous values with an empty string. I took a look at a similar issue of removing basic auth from an app and saw we did something similar there - #15243.

Description of how you validated changes

Updated the existing tests with the new default value.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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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[georeeve]

Exemption Request - I have updated the existing unit test, and integration test snapshots with the new default values. I'm not really sure what I could put in a new integration test, as it'd test the same values as the existing integration tests.

[gracelu0]

Hi @georeeve , thanks for working on this! For the integration tests, I noticed integ.app.ts and integ.codecommit.ts don't use the integ testing framework - would you be up for refactoring these tests to use the IntegTest construct?

[aws-cdk-automation]

This PR has been in the MERGE CONFLICTS state for 3 weeks, and looks abandoned. To keep this PR from being closed, please continue work on it. If not, it will automatically be closed in a week.

[georeeve]

Hi @gracelu0, sure, I'm happy to do that. I did add a few tests in #31771, so maybe it's worth waiting for that to progress first?

[aws-cdk-automation]

The pull request linter fails with the following errors:

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

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[aws-cdk-automation]

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