Increase test code quality for package controller

• Please check this box if this contribution uses AI-generated content as outlined in the GitLab DCO & CLA

What does this MR do and why?

• Applying the use of subject as best practice pattern in test file, see https://www.betterspecs.org/#subject
• Increase clarity, consistency and DRY principle

Changelog: other

🛠 with ❤ at Siemens

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

MR Checklist (@gerardo-navarro)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides

Screenshots or screen recordings

Just changes in the test backend

How to set up and validate locally

1. Execute the relevant test

bundle exec rspec spec/requests/projects/packages/packages_controller_spec.rb