Consider moving emmet completion provider for css to css language service

[ramya-rao-a]

In the new emmet, you get css abbreviations inside the <style> tag. But you get it everywhere inside the style tag including the selectors which is not valid.

Contents of <style> tag should be re-parsed as css to find valid locations for emmet abbr expansion

Or the emmet completion provider for css should be moved to the css language service

[ramya-rao-a]

Moving emmet completion to css language service will also help in sorting the emmet suggestion among css suggestions See the discussion in #28933

This will also help giving css emmet completions inside the style attribute in html tags. See #29066