Add new eslint rule which removes the need to have React in scope

[gaber85]

Description

As of React 17, the need to have React in scope is no longer necessary. JSX Transform was introduced and it takes care of injecting react for us. This ESLint rule removes the warning you would normally get when React is not in scope.

I've also changed all the existing files to remove React as well.

For more information on this subject, be sure to check the blog on JSX Transform.

Comment on the PR if you have any questions.

Motivation and Context

This change will bring the repo to use the new tech available!

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works

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[SauveJeanLuc]

pull latest changes from master

[gaber85]

@SauveJeanLuc I've merged master now. All fast forwarded and passing!