warn -> error for Test Renderer deprecation

We use `console.error` for deprecations. `console.warn` is for less
critical issues, like performance anti-patterns.

Author: acdlite

packages/internal-test-utils/shouldIgnoreConsoleError.js

@@ -23,7 +23,8 @@ module.exports = function shouldIgnoreConsoleError(format, args) {
         ) !== -1 ||
         format.indexOf(
           'ReactDOM.hydrate has not been supported since React 18',
-        ) !== -1
+        ) !== -1 ||
+        format.indexOf('react-test-renderer is deprecated.') !== -1
       ) {
         // We haven't finished migrating our tests to use createRoot.
         return true;

packages/internal-test-utils/shouldIgnoreConsoleWarn.js

@@ -1,11 +1,5 @@
 'use strict';
 
 module.exports = function shouldIgnoreConsoleWarn(format) {
-  if (typeof format === 'string') {
-    if (format.indexOf('Warning: react-test-renderer is deprecated.') === 0) {
-      return true;
-    }
-  }
-
   return false;
 };

packages/react-test-renderer/src/ReactTestRenderer.js

@@ -475,7 +475,7 @@ function create(
       enableReactTestRendererWarning === true &&
       global.IS_REACT_NATIVE_TEST_ENVIRONMENT !== true
     ) {
-      console.warn(
+      console.error(
         'react-test-renderer is deprecated. See https://react.dev/warnings/react-test-renderer',
       );
     }