Add security validation unit tests

[ConnorQi01]

Summary

• Add unit tests for certificate destination path validation, including explicit traversal rejection and iOS simulator path allow/deny cases.
• Add Expo Go version validation coverage through the install command flow for rejected non-numeric versions and valid download paths.
• Add CDP proxy Origin-header validation tests and include CDP proxy tests in the standard extension test runner.

Validation

• npm run build
• npm test

Closes #2688