Fix package name for setup_service/setup_service.go as per the language standards

[RishabhAgarwal-2001]

Context: Pull Request #5314 was recently merged to address Copybara synchronization failures by renaming the internal package from setupservice to setup_service. This was done to match the directory name ( source).

Problem: As noted during the review, the name setup_service contains an underscore, which violates the repository's Go Style Guide ( source). Using underscores in Go package names is unidiomatic and discouraged ( source).

Proposed Solution To satisfy both the Copybara tooling requirements and the style guide, we should:

1. Rename the directory from feature/gnsi/certz/tests/internal/setup_service/ to feature/gnsi/certz/tests/internal/setupservice/ ( source).
2. Update the package declaration inside the Go files back to package setupservice ( source).
3. Update all import references and remove any redundant import aliases in files like trustbundle_test.go ( source).

Reference

• Pull Request: #5314
• Repository Style Guide: Link ( source)