Move findComponent helpers to top of pipeline_editor_tabs_spec.js

Pavan Kumar Sadashivrequested to merge
gitlab-community/gitlab-org/gitlab:hrlpavan-629177-pipeline-editor-tabs-spec-finders into master

What does this MR do and why?

Follow-up from !254829 (merged) to extract findAlert and findAlertButton helper functions to the top of ee/spec/frontend/ci/pipeline_editor/components/pipeline_editor_tabs_spec.js for better reusability across test cases.

References

Closes #629177

How to set up and validate locally

yarn jest ee/spec/frontend/ci/pipeline_editor/components/pipeline_editor_tabs_spec.js

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