feat(#15866): % of users in a11y simulation tool

[jsomsanith]

Issue: #15866

What I did

Add percentage of users in a11y simulation options.
The percentages are hard coded as they don't change often, and putting an api in place will be costly compared to the rare updates we can do here.

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

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[ndelangen]

Thank you for the contribution @jsomsanith !!

[MichaelArestad]

This looks great! Thank you!

[MichaelArestad]

On second thought, it looks like there is a regression with the preview color swatches. Can you take a look to see why these swatches are no longer showing with the correct filters?

Before

After

[jsomsanith]

Nice catch @MichaelArestad
Fixed :)

[MichaelArestad]

It's working perfectly, now! Thank you!

[yannbf]

Hey @jsomsanith thank you so much! This is an awesome contribution 🚀