Use into_owned over to_string for Cow<str> (#39024)

This removes unnecessary allocations when the `Cow` is already owned


Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/git_ui/src/file_diff_view.rs

@@ -241,7 +241,7 @@ impl Item for FileDiffView {
             buffer
                 .read(cx)
                 .file()
-                .map(|file| file.full_path(cx).compact().to_string_lossy().to_string())
+                .map(|file| file.full_path(cx).compact().to_string_lossy().into_owned())
                 .unwrap_or_else(|| "untitled".into())
         };
         let old_path = path(&self.old_buffer);

crates/git_ui/src/git_panel.rs

@@ -2085,7 +2085,7 @@ impl GitPanel {
                             .to_string()
                             .into()
                     } else {
-                        worktree_abs_path.to_string_lossy().to_string().into()
+                        worktree_abs_path.to_string_lossy().into_owned().into()
                     }
                 })
                 .collect_vec();

crates/git_ui/src/text_diff_view.rs

@@ -193,7 +193,7 @@ impl TextDiffView {
             .and_then(|b| {
                 b.read(cx)
                     .file()
-                    .map(|f| f.full_path(cx).compact().to_string_lossy().to_string())
+                    .map(|f| f.full_path(cx).compact().to_string_lossy().into_owned())
             })
             .unwrap_or("untitled".into());