compiler: Workaround Babel bug with unicode in jsx string attrs

Workaround for a bug in older versions of Babel, where strings with unicode are incorrectly escaped when emitted as JSX attributes, causing double-escaping by later processing.

Closes #29120
Closes #29124

ghstack-source-id: 065440d4fb97e164beb8a8f15f252f372a59c5a0
Pull Request resolved: https://github.com/facebook/react/pull/29141