Add lint to remind you not to leave an focused/exclusive test in #2859
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Relevant rule: https://github.com/jest-community/eslint-plugin-jest/blob/ad04fcc97b5dcc676c5bd2152f84608c08e0c50a/docs/rules/no-focused-tests.md
Spawning from #2856 (comment)
Alternatives
There are other ways we could add this functionality but this seems most relevant to us. https://timdeschryver.dev/blog/dont-commit-focused-tests has a decent summary.
Checklist
This change is marked as an internal change (Task), so will not be included in the changelog.