refactor: removed Object.es8 {entries, values} from js polyfills (#…

…40747)

Summary:
Both `hermes` and `JSC` supports `Object.{values & entries}`, so this polyfills aren't used any more.

## Changelog:
[GENERAL][REMOVED]: removed `Object.{values & entries}` from polyfills

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Pull Request resolved: #40747

Test Plan:
1. We can confirm with `hermes` tests: https://github.com/facebook/hermes/blob/main/test/hermes/object-functions.js#L256
2. Remove this polyfills and check that the code runs as expected.
3. You can also run: `console.log(Object.entries.toString());`  and verify that this is `[native code]`

Reviewed By: christophpurrer

Differential Revision: D50100639

Pulled By: robhogan

fbshipit-source-id: b1cea88bd984e99f304a3a063e985eecff8831dd

packages/polyfills/index.js

@@ -12,5 +12,4 @@
 module.exports = () => [
   require.resolve('./console.js'),
   require.resolve('./error-guard.js'),
-  require.resolve('./Object.es8.js'),
 ];

packages/react-native/jest/setup.js

@@ -12,7 +12,6 @@
 const MockNativeMethods = jest.requireActual('./MockNativeMethods');
 const mockComponent = jest.requireActual('./mockComponent');
 
-jest.requireActual('@react-native/js-polyfills/Object.es8');
 jest.requireActual('@react-native/js-polyfills/error-guard');
 
 Object.defineProperties(global, {