chore(cli): improve error message for cdk migrate

[colifran]

Reason for this change

This change is a follow-up to a PR that improved the error message thrown by cdk-from-cfn when an invalid resource property was used in a CloudFormation template. This PR further improves the error message on the cli side.

Description of changes

Primarily, this PR is a verbiage change. The base error message now states that the <stack-name> could not be generated because <error-message>. The error message itself is checked against unreachable because any use of panic!, unreachable!, or unimplemented! will cause the cdk-from-cfn source code to panic in-place. In the resulting wasm binary, this produces a RuntimeError that has an error message of unreachable. I've improved this slightly by stating template and/or language inputs caused the source code to panic. If the error message is not unreachable, then the error message is taken as is with TransmuteError: replaced.

Note that we should still continue to improve our error messages in cdk-from-cfn by by replacing panic!, unreachable!, and unimplemented! with more detailed error messages.

Description of how you validated changes

An existing unit test was changed based on the error message verbiage change. Additionally, a new unit test was added to validate that the expected error message would be thrown by the cli when an invalid resource property was used in a CloudFormation template.

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

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[TheRealAmazonKendra]

@Mergifyio update

[mergify]

update

✅ Branch has been successfully updated

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AWS CodeBuild CI Report

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• Commit ID: 600f8df
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