fix(iam): PrincipalWithConditions.addCondition fails with a new key

[turenar]

fixes #23781

This pr makes PrincipalWithConditions.addCondition bypass validations on the existing condition object if missing.

---

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[gitpod-io]

[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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[TheRealAmazonKendra]

Mergify falling down on the job again.

Pull request has been modified.

[TheRealAmazonKendra]

error An unexpected error occurred: "https://registry.npmjs.org/markdown-it/-/markdown-it-12.3.2.tgz: Request failed \"502 Bad Gateway\"".

Node registry falling down on the job.

[mergify]

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).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9274548
• Result: SUCCEEDED
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[mergify]

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).