Update pipeline_editor_tabs_spec.js for Vue 3 compatibility

Nicole Gerequested to merge
nicolege8/gitlab:feature/vue3-pipeline-editor-tabs-spec into main

What does this MR do and why?

Update pipeline_editor_tabs_spec.js for Vue 3 compatibility

  • Remove Vue.use() and Vue.config (Vue 2 patterns)
  • Update propsData to props (Vue 3 syntax)
  • Update wrapper.destroy() to wrapper.unmount() (Vue 3 API)
  • Remove Vue import, only import nextTick

This addresses Vue 3 migration requirements for the pipeline editor tabs test spec.

References

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https://cap.link/3e88v9qc07jpnha

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