fix: stack account id throws error if not a string

[vinayak-kukreja]

If the account id passed in as stack environment is not a string, then that leads to errors in some lookup functions. This PR is adding a type check for stack's account id and region. These are only allowed to be string datatype.

Closes #21364

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[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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[vinayak-kukreja]

Exemption Request

I believe the unit test already cover the scenario that causes the error. If an env account id or region is not a string, now it should not be able to deploy so integ test would not make sense here. Let me know if that is not the case.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 2a8a0d1
• Result: SUCCEEDED
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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).