Use NoopTextSystem during tests (#28607)

This should allow tests to be more similar across platforms.

Release Notes:

- N/A

crates/editor/src/display_map.rs

@@ -1742,7 +1742,6 @@ pub mod tests {
         }
     }
 
-    #[cfg(target_os = "macos")]
     #[gpui::test(retries = 5)]
     async fn test_soft_wraps(cx: &mut gpui::TestAppContext) {
         cx.background_executor
@@ -1760,7 +1759,7 @@ pub mod tests {
                 editor.update(cx, |editor, _cx| editor.text_layout_details(window));
 
             let font_size = px(12.0);
-            let wrap_width = Some(px(64.));
+            let wrap_width = Some(px(96.));
 
             let text = "one two three four five\nsix seven eight";
             let buffer = MultiBuffer::build_simple(text, cx);
@@ -2411,8 +2410,6 @@ pub mod tests {
         }
     }
 
-    // todo(linux) fails due to pixel differences in text rendering
-    #[cfg(target_os = "macos")]
     #[gpui::test]
     async fn test_chunks_with_soft_wrapping(cx: &mut gpui::TestAppContext) {
         cx.background_executor