fix(cognito-identitypool-alpha): validation error if provided id is a token

[Tietew]

Issue # (if applicable)

Closes #29780.
Closes #28184.

Description of changes

Skips validations if provided id is an unresolved token.

Description of how you validated changes

Added unit tests not to throw errors even if the resolved value is incorrect.

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]

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[Tietew]

Exemption Request
This PR fixes validations only.

[TheRealAmazonKendra]

Thank you for this fix!

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

[mergify]

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[Tietew]

@mergify update

[mergify]

update

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Pull request has been modified.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0bc55e7
• Result: SUCCEEDED
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