test(theme-common): increase filterDocCardListItems test coverage #9064
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Pre-flight checklist
Motivation
I was getting the repo set up locally and looking at the test infrastructure and noticed some coverage missing for the common theme utils - I chose this package and file pretty arbitrarily just as a starting point to look at the code base. The tests added here are primarily a sanity check to make sure the behavior of this function doesn't drastically change, and it pushes up Jest's coverage for the file.
Test Plan
Test links
Deploy preview: https://deploy-preview-9064--docusaurus-2.netlify.app/
Related issues/PRs