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/zed/src/zed.rs

@@ -2874,9 +2874,9 @@ mod tests {
 
         let entries = cx.read(|cx| workspace.file_project_paths(cx));
         assert_eq!(
-                initial_entries, entries,
-                "Workspace entries should not change after opening excluded files and directories paths"
-            );
+            initial_entries, entries,
+            "Workspace entries should not change after opening excluded files and directories paths"
+        );
 
         cx.read(|cx| {
                 let pane = workspace.read(cx).active_pane().read(cx);