Test page scrolling

[galgal12345]

This code opens a Firefox browser, navigates to a desired page, and scrolls down using the arrow keys.   
The code then verifies that the page has been scrolled by checking that the page height has increased.

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Description

Motivation and Context

Types of changes

• Change to the site (I have double-checked the Netlify deployment, and my changes look good)
• Code example added (and I also added the example to all translated languages)
• Improved translation
• Added new translation (and I also added a notice to each document missing translation)

Checklist

• I have read the contributing document.
• I have used hugo to render the site/docs locally and I am sure it works.

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[diemol]

Where would you link this example in the docs? Any reason why you did not use the same page used for the other tests?

[titusfortner]

This is an example for how to send a key with actions class. That belongs in the keyboard examples file.

I don't think we want to create examples for the behavior of every specific key? But we could.

As far as scrolling goes, we want to encourage it to be always done with the scroll wheel going forward.