Replace jsdom with happy-dom testing environment to enable Modal tests (#461)

`happy-dom` is used due to missing HtmlDialogElement support in `jest`.
Just to mention, `happy-dom` provides partial support for dialog element,
so not all test can be implemented.

Author: bedrich-schindler

jest.config.js

@@ -13,7 +13,7 @@ module.exports = {
   setupFilesAfterEnv: [
     '<rootDir>/tests/setupTestingLibrary.js',
   ],
-  testEnvironment: 'jsdom',
+  testEnvironment: '@happy-dom/jest-environment',
   transformIgnorePatterns: [
     'node_modules/(?!(@react-ui-org))',
   ],