Fixed spec violations in devops_adoption_delete_modal_spec

What does this MR do and why?

As part of &5102, fixes spec violations in devops_adoption_delete_modal_spec.js.

Screenshots or screen recordings

No UI changes.

How to set up and validate locally

yarn run jest ee/spec/frontend/analytics/devops_reports/devops_adoption/components/devops_adoption_delete_modal_spec.js

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #413299 (closed)