Merge PatKind::Path into PatKind::Lit

[oli-obk]

Follow-up to #134228

We always had a duplication where Paths could be represented as PatKind::Path or PatKind::Lit(ExprKind::Path). We had to handle both everywhere, and still do after #134228, so I'm removing it now. subsequently we can also nuke visit_pattern_type_pattern

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