Protected packages: Add tests for pypi push protection with deploy token

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What does this MR do and why?

While working on Protected packages: Conan package push protection (!168224 - merged), I noticed that tests related to the deploy token were missing.

Hardening the tests for the pypi push protection with deploy tokens because the current tests only cover the case where a user is passed and not a deploy token.

This is follow-up work for a previous MR, see !135475 (merged)

🛠 with ❤ at Siemens

References

Please include cross links to any resources that are relevant to this MR This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

• Protected packages: PyPI package push protection (!135475 - merged)

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 test related changes. It improves the test coverage for the pypi push protection.

How to set up and validate locally

1. Run test to confirm it is working

bundle exec rspec spec/services/packages/pypi/create_package_service_spec.rb

Related to #323971 (closed)