fix(core): messages from annotations.ts can show up as [object Object]

[lmammino]

CDK Version: 2.115.0 (build 58027ee)
Os: macOS 14.2 (BuildVersion: 23C64)

I have observed the following warning showing up in my console today when running cdk:

[Warning at /CdkStack/AuthorizerFunction] [object Object]

I was able to track down where this message was generated and apply a patch to see the error in a more descriptive format.

For the records the error in my case was:

addPermission() has no effect on a Lambda Function with region=${Token[TOKEN.23]}, account=${Token[TOKEN.24]}, in a Stack with region=${Token[AWS.Region.12]}, account=${Token[AWS.AccountId.8]}. Suppress this warning if this is is intentional, or pass sameEnvironment=true to fromFunctionAttributes() if you would like to add the permissions. [ack: UnclearLambdaEnvironment]

The fix proposed here makes sure that if

I am not sure this is the best way to fix this issue. The signature of the addMessage seems to expect a string for the message value, so maybe the error needs to be corrected downstream where the addMessage call is made (which judging from the stack trace seems to come from aws-cdk-lib/aws-lambda/lib/function-base.js).

Thoughts?

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[kaizencc]

Thanks @lmammino

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

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