task: Always use untruncated label if it is short (#23611)

Also changed rust tasks to be less mouthful.

Release Notes:

- Shortened Rust task labels.
- Task modal will now use full task label when it does not require
truncation.

crates/tasks_ui/src/modal.rs

@@ -791,7 +791,7 @@ mod tests {
         assert_eq!(
             task_names(&tasks_picker, cx),
             vec![
-                "hello from …h.odd_extension:1:1".to_string(),
+                "hello from /dir/file_with.odd_extension:1:1".to_string(),
                 "opened now: /dir".to_string()
             ],
             "Second opened buffer should fill the context, labels should be trimmed if long enough"
@@ -820,7 +820,7 @@ mod tests {
         assert_eq!(
             task_names(&tasks_picker, cx),
             vec![
-                "hello from …thout_extension:2:3".to_string(),
+                "hello from /dir/file_without_extension:2:3".to_string(),
                 "opened now: /dir".to_string()
             ],
             "Opened buffer should fill the context, labels should be trimmed if long enough"