editor: Remove extra quotes from outline search term (#29829)

The outline panel includes quotes around search terms. The rendering
makes it somewhat ambiguous whether these quotes are part of the search
term and are unnecessary, especially given other rendering
differentiation. This PR removes them.

Release Notes:

- N/A

crates/outline_panel/src/outline_panel.rs

@@ -4962,7 +4962,7 @@ impl Render for OutlinePanel {
                         .border_color(cx.theme().colors().border)
                         .gap_0p5()
                         .child(Label::new("Searching:").color(Color::Muted))
-                        .child(Label::new(format!("'{}'", search_state.query))),
+                        .child(Label::new(search_state.query.to_string())),
                 )
             })
             .child(self.render_main_contents(query, show_indent_guides, indent_size, window, cx))