chore: address some comments from Code Quality Bot

[lym953]

What does this PR do?

Address some comments from @datadog-datadog-prod-us1 on https://github.com/DataDog/datadog-cdk-constructs/pull/285

Motivation

No major change, so just npm test

Testing Guidelines

No major change, so just npm test

Additional Notes

Types of Changes

• [ ] Bug fix
• [ ] New feature
• [ ] Breaking change
• [x] Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• [ ] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [x] This PR's changes are covered by the automated tests
• [ ] This PR collects user input/sensitive content into Datadog