Remove unused selectedLabelsList getter to fulfill eslint rule no-unused-property

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What does this MR do and why?

Removes the unused selectedLabelsList Vuex getter from dropdown_contents_labels_view.vue. The getter was mapped but never used in the component.

This addresses one vue/no-unused-properties violation in app/assets/javascripts/sidebar/ as part of #525766 (closed) .

Created during the GitLab Meetup Hamburg hands-on session: https://www.meetup.com/gitlab-meetup-hamburg/events/311048113/ .

🛠️ with ❤️ at Siemens

References

• Closes #525766 (closed)

Screenshots or screen recordings

N/A

How to set up and validate locally

• Run ESLint to verify no violations:

  yarn eslint app/assets/javascripts/sidebar/components/labels/labels_select_vue/dropdown_contents_labels_view.vue

• Verify file removed from ESLint todo list:

  grep "dropdown_contents_labels_view.vue" .eslint_todo/vue-no-unused-properties.mjs

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
• No changelog needed (internal code quality improvement only)
• Existing tests cover the change (no new tests required)
• ESLint validation passes without warnings