test: Improve test performance for Groups::UpdateService

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What does this MR do and why?

test: Improve test performance for Groups::UpdateService

Changelog: other

🛠️ with ❤️ at Siemens

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Run the test with factory profiling (FPROF)

FPROF=1 bundle exec rspec spec/services/groups/update_service_spec.rb:31

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 #561512