1868950 - Remove `deemphasized` and `deemphasized-text` classes in favor of `text-deemphasized`

Status: NEW

(Toolkit :: Themes, task, P3)

Description

[Dão Gottwald [:dao]]

+++ This bug was initially created as a clone of Bug #1834051 +++

The text-deemphasized class from bug 1798404:

https://searchfox.org/mozilla-central/rev/23e7e940337d0e0b29aabe0080e4992d3860c940/toolkit/themes/shared/design-system/text-and-typography.css#30-33

... should replace the slightly older deemphasized class:

https://searchfox.org/mozilla-central/rev/23e7e940337d0e0b29aabe0080e4992d3860c940/toolkit/themes/shared/global-shared.css#336-338

So we should remove the latter, and update the places where it's used:

https://searchfox.org/mozilla-central/search?q=class%3D%28%22%7C%22.*+%29deemphasized%28+%7C%22%29&path=&case=true&regexp=true

There's also a deemphasized-text class that should get the same treatment:

https://searchfox.org/mozilla-central/search?q=deemphasized-text%28%22%7C+%29&path=&case=true&regexp=true