React 19.3.0 sync int React Native OSS (#58446)

Summary:

Sync of React 19.3.0 into React Native

Changelog: [General][Changed] - Sync React 19.3.0 into React Native

jest_e2e[run_all_tests] bypass-github-export-checks

Differential Revision: D119490598

Author: rubennorte

package.json

@@ -108,8 +108,8 @@
     "node-fetch": "^2.2.0",
     "nullthrows": "^1.1.1",
     "prettier": "3.9.4",
-    "react": "19.2.3",
-    "react-test-renderer": "19.2.3",
+    "react": "19.3.0",
+    "react-test-renderer": "19.3.0",
     "rimraf": "^3.0.2",
     "shelljs": "^0.8.5",
     "signedsource": "^2.0.0",