fix: support parsing camel case in container queries

[tanhauhau]

Fixes #10845

The eatIdent(...) method from css-tree somehow expects lowercase identifiers only, and thus not working for camel case container names. switching to a more generic eat(Ident) would work. Since we already know the current token is an identifier with the name, we dont have to assert the content of the identifier via eatIdent()

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