Fix the test and improve E2eSsrEnv for jest as needed

[birdofpreyru]

For now it is blocked by #264, and might be automatically resolved once that issue is fixed.

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See the TODO comment in the code:

react-utils/__tests__/client-side.js

Lines 1 to 20 in 80e5063

	/** @jest-environment jsdom */
	import mockdate from 'mockdate';
	import { mockClientSide } from 'utils/jest';
	mockdate.set('2020-04-19Z');
	// TODO: This was disabled after upgrade of axios to 1.0.0, as it uses not
	// compiled ES imports, and thus requires client side to use webpack build
	// environment. However, current implementation of E2eSsrEnv has misc issues
	// to make it work: SASS fails if we can't set correct context needed to resolve
	// SCSS imports.
	test.skip('Export at client side', () => {
	mockClientSide();
	const lib = require('../src');
	expect(lib).toMatchSnapshot();
	expect({ ...lib._ }).toMatchSnapshot();
	expect({ ...lib.api }).toMatchSnapshot();
	expect(Object.keys(lib.time)).toMatchSnapshot();
	});