YoastSEO.js: import the screen-reader-text CSS class from yoast-components

[afercia]

In the yoastseo package, the _analysis.scss file has its own screen-reader-text CSS class:

https://github.com/Yoast/javascript/blob/6631fd1e51d49a1f23fd2c3a72987801171168f0/packages/yoastseo/css/_analysis.scss#L56-L62

This ruleset is out of date. The screen-reader-text CSS class is subject to changes once in a while. Ideally we should have a centralized location as canonical source of this CSS rule and use it across all projects for easier maintenance.

I'd like to propose to import if from yoast-components as done for MyYoast in https://github.com/Yoast/my-yoast/pull/2485