[feat]: New disabled state UI for the ghost variant of the IconButton

[lucasboilly]

A clear and concise description of what the feature is

A new and simpler disabled state UI for the ghost variant of the IconButton.

Why should this feature be included?

Its current disabled state is the same as for all the other variants of the IconButton, but in some specific contexts it's too visible and it doesn't look good. That's why we need a more discret version.

You can see a comparison of how it looks like today and how we want it to look like in this screenshot:

Please provide an example for how this would work

The icon color should be changed to neutral200.

[HichamELBSI]

By doing this, the contrast between the neutral200 and the background will be very very bad. Since it is a disabled button, it must be distinguishable (compared to a decorative element). Especially since we are mentioning accessibility in our doc 😅.