Another pass of #[allow()] removal (#3825)

We still have a bunch of leftovers in ui2/theme2 and in gpui2
display_link module.

Release Notes:

- N/A

crates/text2/src/text2.rs

@@ -1189,7 +1189,6 @@ impl Buffer {
         self.undo_or_redo(transaction).log_err()
     }
 
-    #[allow(clippy::needless_collect)]
     pub fn undo_to_transaction(&mut self, transaction_id: TransactionId) -> Vec<Operation> {
         let transactions = self
             .history
@@ -1223,7 +1222,6 @@ impl Buffer {
         }
     }
 
-    #[allow(clippy::needless_collect)]
     pub fn redo_to_transaction(&mut self, transaction_id: TransactionId) -> Vec<Operation> {
         let transactions = self
             .history
@@ -1536,7 +1534,6 @@ impl Buffer {
         edits
     }
 
-    #[allow(clippy::type_complexity)]
     pub fn randomly_edit<T>(
         &mut self,
         rng: &mut T,