test(lambda): remove Lambda user-agent debugging tests

[valerena]

We'll add them in the future once we're sure they don't cause issues in other tests

Problem

WebSocket close timed out, forcing termination
WebSocket close timed out, forcing termination
notifications: Attempting to fetch notifications for category: emergency at endpoint: https://idetoolkits-hostedfiles.amazonaws.com/Notifications/VSCode/emergency/1.x.json

Solution

We manually verified this implementation. We want to add similar tests in the future, but that don't cause other issues.

---

• Treat all work as PUBLIC. Private feature/x branches will not be squash-merged at release time.
• Your code changes must meet the guidelines in CONTRIBUTING.md.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[amazon-inspector-ohio]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[amazon-inspector-ohio]

✅ I finished the code review, and didn't find any security or code quality issues.