fix(events-targets): KinesisStream target not working when the stream is encrypted using a customer kms key

[BalmungSan]

Issue #10996

Closes #10996

Reason for this change

Unless there is a specific reason that I am missing, I don't see why it was necessary to manipulate the policy directly rather than delegate to the granWrite method already provided by the IStream interface, whose implementation would automatically also add the necessary KMS permissions to the Role.

Description of changes

Use stream.grantWrite rather than managing the IAM policy directly.

Description of how you validated changes

Delegating to existing unit tests. I would also test these changes on our real code if a SNAPSHOT is released.

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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[BalmungSan]

TBH I am not putting more effort into this, I looked at the tests and I have no idea how I am supposed to know the id-like characters needed to add a test checking if the policy also adds the required KMS permissions.
Feel free to commit over the PR or just copy the changes.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9cbd3e1
• Result: FAILED
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