fix(events-targets): ApiGateway events target should accept IRestApi

[n-k1]

Issue

Closes #16423.

Reason for this change

The CDK construct to set an APIGatway as the target for an EventBridge rule only accepted RestApi. It should instead accept the interface IRestApi.

Description of changes

This change was attempted once earlier, but the PR was closed.

Changed the ApiGateway target's constructor's first argument from api.RestApi to api.IRestApi.

To fix compatibility failures caused by the previous restApi being a public member of the class, I've followed the approach suggested here. Some other alternatives are suggested here.

Description of how you validated changes

Added a unit test that creates a dummy SpecRestApi. Also added an integ test that creates a SpecRestApi from a dummy OpenAPI spec and creates a rule on the default event bus with the APIGateway as target. Nothing is executed in the integ test. The assertion only checks if the target is created using the ListTargetsByRule API.

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

[aws-cdk-automation]

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

[msambol]

This LGTM. Moving to maintainer review. I'd like @rix0rrr to review this since he had feedback on the previous PR.

Pull request has been modified.

[gracelu0]

Thank you for your contribution!

[mergify]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 6abd285
• Result: SUCCEEDED
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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).