Add tests for React 16 to CI

[alexeyr-ci2]

Summary

Make sure we don't accidentally break React 16 support.

Closes #1679.

Pull Request checklist

• Add/update test to cover these changes
• [ ] Update documentation
• [ ] Update CHANGELOG file

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[alexeyr-ci2]

Instead of this we can either:

1. Include something like #react18 in the description of these tests and filter them out;
2. Use https://www.npmjs.com/package/jest-runner-groups.

Any preference?