style: Un-prefix -moz-tab-size (keeping the prefixed version as an alias for now)

This results in lots of new WPT test passes.

There were also a couple of WPT tests that turned out to be broken;
tab-size-inline-001 and -002 had errors in their reference files such
that they'd never pass anywhere. So those are fixed here.

Depends on D117331

Differential Revision: https://phabricator.services.mozilla.com/D117332

components/style/properties/counted_unknown_properties.py

@@ -25,7 +25,6 @@ COUNTED_UNKNOWN_PROPERTIES = [
     "-webkit-user-modify",
     "-webkit-margin-before",
     "-webkit-margin-after",
-    "tab-size",
     "-webkit-margin-start",
     "-webkit-column-break-inside",
     "-webkit-padding-start",