es5BrowserSupport add additional polyfill

[fetters5]

🚀 Feature request

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Description

When setting "es5BrowserSupport": true in angular.json I get errors in IE 11 because it does not recognize .includes()
TypeError: Object doesn't support property or method 'includes'

This issue below gave the original workaround, perhaps now that it is in a conditional polyfill we can add it by default.
#4128

Describe the solution you'd like

Add the following polyfill to the Conditional ES5 Browser Polyfill so that .includes() works with IE 11
import 'core-js/es7/array';

Describe alternatives you've considered

I can keep import 'core-js/es7/array'; in the main polyfill file, but it is not needed by other browsers

[alan-agius4]

The includes, is not part of the ES6 but ES7 specs.

Hence some browsers that support ES6 might still need to use this polyfill to function properly.

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