fix(aws-iam): generate warning when using addManagedPolicy on an imported Role

[gshpychka]

Related issue:
#8307

[gitpod-io]

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: 57c945d
• Result: SUCCEEDED
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[gshpychka]

Please advise the proper way to test warning generation.

[gshpychka]

@rix0rrr Not sure how to proceed - please advise

[gshpychka]

@nija-at what do I have to do to have this merged?

[TheRealAmazonKendra]

@gshpychka Thank you for making this change. A test for this would be something along the lines of:

Annotations.fromStack(stack).hasWarning('/Path/To/Node', 'warning message');

[github-actions]

This PR has been in the MERGE CONFLICTS state for 3 weeks, and looks abandoned. To keep this PR from being closed, please continue work on it. If not, it will automatically be closed in a week.

[github-actions]

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

[miekassu]

This is still an issue

[Lanayx]

For some reason this warning is not properly displayed in console I only see the following

[Warning at /CdktestStack/myRoleId] [object Object]