Summary: Update `react-devtools-core` and `react-devtools` dependencies for RN, VSCode, Sonar, etc. # Changelog: [General][Changed] - Upgraded react-devtools-core dependency to 4.12.0 Reviewed By: gaearon Differential Revision: D27764688 fbshipit-source-id: faa179cf4be3b49b14244d47ee0b91ae63138b8b