Fix spec violations in create_issue_form_spec.js

Frédéric Capletterequested to merge
391181-fix-spec-violations-in-ee-spec-frontend-related_items_tree-components-create_issue_form_spec into master

What does this MR do and why?

remove spec violations in ee/spec/frontend/related_items_tree/components/create_issue_form_spec.js for Vue3 migration.

Screenshots or screen recordings

none

How to set up and validate locally

Green pipeline is all we need

MR acceptance checklist

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

Related to #391181 (closed)

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