feat(css): add friendly errors for IE hacks that are not supported by lightningcss #19072
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Description
This PR improves the error message for parcel-bundler/lightningcss#39.
I assume there won't be many people facing this, but it is difficult to know what needs to be done from the error message (
SyntaxError: Unexpected token
). I added why the error is happening and what users can do about it.