Auto merge of #17270 - davidbarsky:david/fix-completions-from-associated-types, r=Veykril

fix: ensure implied bounds from associated types are considered in autocomplete

closes: #16989

rust-analyzer needs to consider implied bounds from associated types in order to get all methods suggestions people expect. A pretty easy way to do that is to keep the `candidate_trait_id`'s receiver if it matches `TyFingerprint::Unnameable`.  When benchmarking this change, I didn't notice a meaningful difference in autocomplete latency.

(`TyFingerprint::Unnameable` corresponds to `TyKind::AssociatedType`, `TyKind::OpaqueType`, `TyKind::FnDef`, `TyKind::Closure`, `TyKind::Coroutine`, and `TyKind::CoroutineWitness`.)

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