Remove React.error and React.warn (#16126)

* Remove React.error/React.warn with React.getComponentStack

Author: Brian Vaughn

packages/react/src/React.js

@@ -51,7 +51,6 @@ import {
   jsxWithValidationDynamic,
 } from './ReactElementValidator';
 import ReactSharedInternals from './ReactSharedInternals';
-import {error, warn} from './withComponentStack';
 import createEvent from 'shared/createEventComponent';
 import {enableJSXTransformAPI, enableFlareAPI} from 'shared/ReactFeatureFlags';
 const React = {
@@ -72,9 +71,6 @@ const React = {
   lazy,
   memo,
 
-  error,
-  warn,
-
   useCallback,
   useContext,
   useEffect,