chore: Prepare for Rust edition bump to 2024 (without autofix) (#27791)

Successor to #27779 - in this PR I've applied changes manually, without
futzing with if let lifetimes at all.

Release Notes:

- N/A

crates/debugger_ui/src/session/running/variable_list.rs

@@ -437,7 +437,9 @@ impl VariableList {
         });
 
         if res.is_none() {
-            log::error!("Couldn't confirm variable edit because variable doesn't have a leaf name or a parent reference id");
+            log::error!(
+                "Couldn't confirm variable edit because variable doesn't have a leaf name or a parent reference id"
+            );
         }
     }