[FSE] Add option to display button labels instead of icons

[aurooba]

What problem does this address?

Icons aren't always the friendliest way to interact with interfaces in general, labels and texts are often better at helping people acclimate to a new interface.

What is your proposed solution?

I'd love if the Site Editor also included the option to Display button labels like the Block Editor does in some sort of Preferences area – and in fact, these options should be connected, so setting in the Block Editor context should be honoured in the Site Editor context, and vice versa.

[annezazu]

This was handled in a PR that landed in Gutenberg 12.9 and it'll land in 6.0 :)

#38317

Closing this out as a result.