[Gecko Bug 1694141] Implement :user-valid and :user-invalid. #27754
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And alias :-moz-ui-valid and :-moz-ui-invalid to them.
There are CSSWG resolutions for these for quite a while, and spec for
user-invalid.
Differential Revision: https://phabricator.services.mozilla.com/D105966
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1694141
gecko-commit: 05e013ea94bfa78102ec3ed7a7aa55ae14a0b323
gecko-reviewers: xidorn