chore(appmesh): reference interfaces

[rix0rrr]

Reference interfaces for L2s, like #35271.

"chore" because I plan to make a lot of these PRs and they're not adding value to the changelog.

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[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
Security Guardian Results	52 ran	50 passed		2 failed

Test	Result
Security Guardian Results
packages/@aws-cdk-testing/framework-integ/test/aws-events-targets/test/sqs/integ.sqs-event-rule-target.js.snapshot/aws-cdk-sqs-event-target.template.json
sqs-encryption-enabled.guard	❌ failure
sqs-no-world-accessible-inline.guard	❌ failure

• View Security Guardian Results

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
Security Guardian Results with resolved templates	52 ran	50 passed		2 failed

Test	Result
Security Guardian Results with resolved templates
packages/@aws-cdk-testing/framework-integ/test/aws-events-targets/test/sqs/integ.sqs-event-rule-target.js.snapshot/aws-cdk-sqs-event-target.template.json
sqs-encryption-enabled.guard	❌ failure
sqs-no-world-accessible-inline.guard	❌ failure

• View Security Guardian Results with resolved templates

[rix0rrr]

We can't merge this. The identifiers here are confused.

The spec says that the primary identifier is the Id field, the CloudFormation docs say that it's the ARN field.