CSS quick fix should suggest to use validProperties settings

[isidorn]

Refs: #62049

Have the following css:

nav > a:hover::before {
	isidor: 5;
}

Notice the warning and the quick fixes. I would expect the quick fix to offer to add "isidor" to the "validProperties" setting. That way we would make this setting more discoverable

[octref]

We don't suggest them in IntelliSense either. I think a more sensible approach would be allow #2784 for HTML / CSS. This allows people to add their own definitions to the collections of HTML/CSS tags/properties we source from MDN. We can then update all language features to base off that collection.

That setting is meant as a quick-dirty way to shut up the linter. I don't hope we base all CSS language features from one small setting.

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[isidorn]

Ok makes sense, thanks for the explanation.