Use vanilla JS instead of jQuery for the Cookies & Consents widget

[kienstra]

• No expected change in functionality.
• Uses vanilla JS instead of jQuery

Is this a new feature or does it add/remove features to an existing part of Jetpack?

This isn't a new feature, it only modifies an existing feature.

Testing instructions:

1. In the Customizer, add a Cookies & Consents Banner widget to a sidebar

2. Exit the Customizer

3. Expected: the widget appears at the bottom

4. Expected: clicking 'Close and accept' dismisses it
   

5. Delete the eucookielaw cookie from the browser

6. In the Customizer, change some of the widget options. Like 'after the user scrolls the page.'

7. Ensure the widget works as expected

Proposed changelog entry for your changes:

• Use vanilla JavaScript in the Cookies and Consents widget

[jetpackbot]

	Warnings
⚠️	The PR is missing at least one [Status] label. Suggestions: [Status] In Progress, [Status] Needs Review

This is an automated check which relies on PULL_REQUEST_TEMPLATE. We encourage you to follow that template as it helps Jetpack maintainers do their job. If you think 'Testing instructions' or 'Proposed changelog entry' are not needed for your PR - please explain why you think so. Thanks for cooperation 🤖

Generated by 🚫 dangerJS against 94756c6

[kraftbj]

Reviewed in Chrome/Firefox.