Enable migration of insights-chrome, build tools and tenant apps to React 19. 

React 18.3 was designed specifically to provide deprecation warnings for React 19 breaking changes. 

1. Get all tenants to migrate to React 18.3 and ensure build using "jsx": "react-jsx"
2. Provide docs containing:
   • Instructions and links to using Codemods for automatic code migration
     https://react.dev/blog/2024/04/25/react-19-upgrade-guide#codemods
   • Solutions to stubborn deprecation warnings
3. Add an insights-chrome monitoring system to track React 19 migration readiness across tenant apps
   • Is there existing infrastructure we can piggy back on?
4. Once all tenant apps are React 19 ready, update insight-chrome to React 19 and tenant apps should just work. 

Official React 19 migration guide
https://react.dev/blog/2024/04/25/react-19-upgrade-guide 

Initial React 19 migration spike
https://docs.google.com/document/d/1StMGvvRctcSAR-2wOAnGVX7-sRptxGm25Q0tg49tE8c/edit?usp=sharing

Doc about self-hosted Glitchtip (replaces Sentry)
https://docs.google.com/document/d/1afqPPvYzDkwJgJOE3jy2N8UsqqvGa-CU6JApaoPHy4g/edit?usp=sharing