test: Apply table syntax for better readability

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What does this MR do and why?

While working on another MR, I noticed that an aspect of the test spec/requests/api/maven_packages_spec.rb could be improved, e.g. in terms of readability and complexity. This MR encapsualtes and focsusses only on these changes.

🛠️ with ❤️ at Siemens

References

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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

Only changes regarding backend test.

How to set up and validate locally

1. Run the test

bundle exec spec/requests/api/maven_packages_spec.rb -e 'with basic auth'

Related to #323969 (closed)