Add list header test
What does this MR do and why?
Add list header test
- add required prop to tests
Changelog: added
EE: true
MR acceptance checklist
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Screenshots or screen recordings
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
- Run
yarn jest ee/spec/frontend/security_orchestration/components/policies/list_header_spec.js - Verify no warnings appear in the console
Related to #477730 (closed)