Remove .only from mocha test

[charisk]

I believe this was accidentally checked in with this commit.

This is a very easy mistake to make, so we should look at blocking the PR when a .only is left in.

Checklist

N/A:

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[shati-patel]

Thanks! 🙇🏽‍♀️