Revert "Webapp: Update @reach-ui and react-focus packages versions (#30845)"
Created by: mrnugget
This reverts commit ea48af518d39cffbb3e962ff8b89318e368123a2 because it seemingly breaks e2e and QA test suites: https://buildkite.com/sourcegraph/sourcegraph/builds/131093
Test plan
- No local testing. Reverting to previous state only.