Protected packages: Consolidate tests for CheckRuleExistenceService

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What does this MR do and why?

refactor: Consolidate tests for CheckRuleExistenceService

In order to optimze test performance, I noticed that it is possible to consolidate the tests regarding deploy tokens into one test table.

Changelog: other

🛠️ with ❤️ at Siemens

References

Screenshots or screen recordings

How to set up and validate locally

1. Run the test

bundle exec rspec spec/services/packages/protection/check_rule_existence_service_spec.rb

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 style guides
• Conforms to the javascript style guides
• Conforms to the database guides
• Conforms to the merge request performance guidelines

Related to #323972