ui: Ensure Label with single_line set does not wrap (#21444)

Release Notes:

- N/A

---

Split from #21438, this change for make sure the `single_line` mode
Label will not be wrap.

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/ui/src/components/label/highlighted_label.rs

@@ -65,6 +65,11 @@ impl LabelCommon for HighlightedLabel {
         self.base = self.base.underline(underline);
         self
     }
+
+    fn single_line(mut self) -> Self {
+        self.base = self.base.single_line();
+        self
+    }
 }
 
 pub fn highlight_ranges(