Truncate commit messages in blame tooltip (#9937)

This truncates git commit messages to 15 lines.


Before:
![screenshot-2024-03-28-20 10
17@2x](https://github.com/zed-industries/zed/assets/1185253/03bea6bb-2ead-4bf6-bb12-22338c8745fd)

After:

![screenshot-2024-03-28-20 10
02@2x](https://github.com/zed-industries/zed/assets/1185253/0bd655ee-57ce-424f-b471-b7ce01e5fbf7)




Release Notes:

- N/A

crates/editor/src/element.rs

@@ -3011,11 +3011,8 @@ impl Render for BlameEntryTooltip {
         };
 
         let message = match &self.commit_message {
-            Some(message) => message.clone(),
-            None => {
-                println!("can't find commit message");
-                self.blame_entry.summary.clone().unwrap_or_default()
-            }
+            Some(message) => util::truncate_lines_and_trailoff(message, 15),
+            None => self.blame_entry.summary.clone().unwrap_or_default(),
         };
 
         let pretty_commit_id = format!("{}", self.blame_entry.sha);